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rargi="olght:20px;pi2indess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi2indess= id="rs=随便看a咀亍渴种杆偎憧诰 - 春光愈< iptra5%8D"#m=6">ht= rargi="olght:20px;pi2inde height : nde ecorahtmlnt: 2emess= idter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idstrong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i准备:家长在带读以下口决并做相关手指游戏前,需发出口令“清零”元阶儿马上双客 髡疲环唇粑账谛厍埃劬嵘褡龊米急浮#ㄗ⒁猓菏中某铮饺涓粢苑奖闼统鲋肝迹炔灰膊灰丁#/liter" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i一>ter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i手指定位口决 我有一双客,代表九十九,左手定十位,九十我会数元揭手定个位,从一数到九:加减很方便,计算不用愁。br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i二>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i手指定数口决 食指伸开ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“1”ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i中指伸开ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“2”ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i无名指伸开为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“3”ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i小指伸开ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“4”ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 四指一握伸拇指新来指是“5”要记住,再伸食指到小指pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i6、7、8 、9pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i排成数。br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i三pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i揭手出指练习口决一马当先,二虎相争,三言两语,四海为家,五谷丰登,六畜兴旺,七上八下,八仙过海,九牛一毛,十万为急。一言九鼎,二龙蟙i椋愣αⅲ拿娉瑁骞确岬牵裎拗鳎呱习讼拢嗣媪徵纾排R幻馈#ㄗⅲ耗畹健笆蚧鸺薄被颉笆馈笔痹沂治杖笫殖> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“1”ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i,代表进位。br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i四>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i左手出指练习口决一十,二十,三十,四十,五十,六十,七十,八十,九十,一百。(注:念到”一百“时元双客 髡疲缓蠼粑账谛厍啊#/liter" > ter" >< iter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= iiptra5%8D"#m=6">ht= rargi="olght:20px;pi3 ndenheight : indenecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= id/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i    速算口诀>弔er" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i两位数乘法速算口诀 一般口诀:>br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i首位之积排在前,首尾交叉积之和十倍再加尾数积。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i37x64=1288+(3x4+7x6)x10=2368>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i同尾互补,首位乘以大一数,尾数之积后面接。 如:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i23×27=621>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i2>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i尾同首互补,首位之积加上尾,尾数之积后面接。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i87×27=2349pater" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i首位差一尾数互补者,大数首尾平方减。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i76×64=4864>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i4>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i末位皆一者,首位之积接着首位之和,尾数之积后面接。如:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i51×21=pe71>br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i------- “几十一乘几十一”速算 特殊:用于个位是1的平方,如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i21×21=441>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i5>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i首同尾不同,一数加上另数尾,整首倍后加上尾数积。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i23×25=575> ter" >ht= rargi="olght:20px;pi3 ndenheight : indenecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= id/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20pht: 3 ndess= i速算 >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i,首位皆一者,一数加上另数尾,十倍加上尾数积。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i17×19=323---- >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i1>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(即>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i11~a>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i11×11=p21>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i---- “十几平方”br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i速算 >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i首位皆二者,一数加上另数尾,廿倍加上尾数积。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i25×29=725---->ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“二十几乘二十几”br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i速算 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i57×57=3249---->ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“五十几乘五十几”br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i速算 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i95×99=8505---->ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i“九十几乘九十几”br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i速算 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i46×46=2116---- >br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i速算 >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i首位是五平方者,廿五加上尾,尾数平方后面接。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i51×51=2601---->ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i “五十几平方”br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i6、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i互补乘以叠数者,首位加一乘以叠数头,尾数之积后面接。>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i37×99=3663 7、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i末位是五平方者,首位加一乘以首,尾数之积后面接。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i65×65= 4&ty---- >br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i7、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i某数乘以一一者,首尾拉开,首尾之和中间站。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i34×11=3 3+4 4=374 9pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i、某数乘以十五者,原数加上原数的一半后后面加> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i0>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(原数是偶数)或小数点往后移一位。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i151×15=2265,246×15 =3690>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i8、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i一百零几乘一百零几,一数加上另数尾,尾数之积后面接。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i108×107=mp556>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i9、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i俩数差2者,俩数平均数平方再减去一。如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i49x51=50x50-1=2499pater" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i10、>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i几位数乘以几位九者,这个数减去(位数前几位的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i+1)>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i0。br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1/liter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i一个数乘>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i9:>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i这个数减去(个位前几位的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i+1)>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i10 4×9=36 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i0, 4-><1/=3,>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i末位是>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= ia><4=6 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i36 783×9=7047 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i78,783-78<1/=704,>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i末位是>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= ia><3=7 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i7047>br rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i2/liter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i一个数乘>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i99:>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i这个数减去(十位前几位的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i+1/liter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i新扩两位 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= ia>0: 14×99= 14-><1/=1wtm10><14=8 b138 b158×99= 158-(1+1)=p56tm10><58=42b156nb 7357×99= 7357-(73+1)=7283m10><57=43 728343 ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i999:>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i可以依照上面的方法进行推理:这个数减去(百位前几位的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i+1/liter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i新扩三位 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= ia>0;">1234×999= 11234-/a>1+1/=>1222pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i末三位是>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i10>0-234=766,>1222766 ter" i ter" >ter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= iiptra5%8D"#m=6">ht= rargi="olght:20px;pi3 ndenheight : indenecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= id/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20pht: 3 ndess= i常用速算口诀(三则/liter" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i(一/liter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i十几与十几相乘>br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i十几乘十几pater" >br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i方法最容易, ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i保留十位加>位, ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i添零再加>位积。 ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i证明:设 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= im、n >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i1>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 至 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i9pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 的任意整数,则 ter" ibr rargi="olght:20px;pi3 ndess= id ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i<玬//a><玭/lbr rargi="olght:20px;pi3 ndess= i=10><10m<10n+mnlbr rargi="olght:20px;pi3 ndess= i=10〔a><╩<玭/〕+mn。 ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i例:> ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i17×l6lbr rargi="olght:20px;pi3 ndess= i∵a>< 7+6/=23 ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(第三句/, ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i∴23><7×6=23><42=272 ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(第四句/, ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i∴17×16=272。 ter" i ter" > ter" >ter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= iiptra5%8D"#m=6">ht= rargi="olght:20px;pi3 ndenheight : indenecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= id/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i(二)十位数字相同、>位数字互补(和为a><┑牧轿皇喑>br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i十位同,>位补, ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i两数相乘要记住:>br rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i十位加一乘十位, ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i>位之积紧相随。 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i证明:设 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= im、n ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i1>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 到 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i9pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i 的任意整数,则 ter" ibr rargi="olght:20px;pi3 ndess= id ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i/a>m<玭/〔a>m</a><璶/〕lbr rargi="olght:20px;pi3 ndess= i=10>m(m<1/+n/a><璶/。 ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i例:3 ter" i ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i4×36lbr rargi="olght:20px;pi3 ndess= i∵/a><1/×3=4×3=12 ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(第三句/, ter" ibr rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i>位之积 ter" i ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i4×6=24, br rargi="olght:20px;pi3 ndess= i∴34×36=1224。 ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i (第四句/ ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i注意:两个数之积小于 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i10 > ter" >ter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= iiptra5%8D"#m=6">ht= rargi="olght:20px;pi3 ndenheight : indenecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= id/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;p 3 ndess= i(三)用 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i11 >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1 ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i 至 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i9 >ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= istrong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i/a>m<玭/×/a><1/=10>m<玜><╩<玭/+n。 br rargi="olght:20px;pi3 ndess= ii ter" 例:> strongrgltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i36×ll br rargi="olght:20px;pi3 ndess= i∵306+90=396, br rargi="olght:20px;pi3 ndess= i∴36×11=396。 br rargi="olght:20px;pi3 ndess= ii ter" 注意:当两位数字之和大于 ter" iltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i10 > ter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= im<玜, ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i如:>br rargi="olght:20px;pi3 ndess= ii ter" >ter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idltrong rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i84×11 br rargi="olght:20px;pi3 ndess= i∵804<玜2×10=804<玜20=924, br rargi="olght:20px;pi3 ndess= i∴84×11=924。 br rargi="olght:20px;pi3 ndess= ii ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i昨天在山东公共频道看了周根项速算大师的讲堂,看了电视上举例讲到的“一分钟速算口诀”元觉得非常好,所以跟大家分享一下:两位数相乘,在十位数相同、>位数相加等于 ter" iltrong rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i10>ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i的情况下,如>ltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i62×68=4216 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i计算方法:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i6×(6+1/=42 ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(前积), ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i2×8=16 ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(后积)。 ter" i ter" > ter" >ter"nrpx;="4ss= rargi="olght:20px;pi3 ndess= idter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= iiptra5%8D"leftss= rargi="olght:20px;pi3 ndenheight : nde ecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= iiltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= i一分钟速算口诀中对特殊题的定理是:>< i ter" >ht= rargi="olght:20px;pi2inde height : nde ecorahtmlnt: 2emess= idter"nrpx;="4ss= rargi="olght:20px;pi3 ndess= idltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= iiter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i任意两位数乘以任意两位数,只要魏式系数为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i“0” ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i/a)33×46=1518>ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(个位数相加小于 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i10, ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i所以十位数小的数字i ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3 ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i不变,十位大的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i4>ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i必须加i ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3×(4+1/=15>ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(前积), ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3×6=18> ter" >ltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1518>br rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i如>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i/2/84×43=3612 ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(个位数相加小于 ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i10, ter" iter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i十位数小的数4不变 十位大的数pater" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i8>ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i加i ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i4×(8+1/=36l ter" >ter"nrargi="olght:20px;pi3 ndenter"-family: 黑体ess= i(前积), ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3×4=12 ter" i ter" >ltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3612 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i如> ter" >br rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i计算方法:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i4×(2+1/=12 ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i(前积), ter" iter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i6×8=48> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i1248>br rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i如(l ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i平方l ter" > ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i计算方法l ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i24×(24+1/=600l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i(前积), ter" i ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i两积组成:> ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= iab×cd >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i=(a-c)×d+(b+d-10)×cl ter" > ter" >< iter"n4px;="4ss= rargi="olght:20px;pi3 ndess= idter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= iiptra5%8D"centerss= rargi="olght:20px;pi3 ndenheight : nde ecorahtmlnt: 2emess= idbr rargi="olght:20px;pi3 ndess= ii/ ixter" >strong rargi="olght:20px;pi3 ndess= idter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= idter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndess= i“头乘头,尾乘尾,合零为整,补余数。”br rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i1.l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i先求出魏式系数l ter" >br rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i2.l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i头乘头(其中一项加一)为前积 适应尾相加为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i10>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i的数/liter" >br rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i3.l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i尾乘尾为后积。 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndess= i4.l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i两积相连,在十位数上加上魏式系数即可 。 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i如:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i76×75,87×84>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i吧,凡是十位数相同>位数相加为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i11>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i的数,它的魏式系数一定是它的十位数的数 。 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i如:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i76×75l ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i魏式系数就是>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i7,87×84>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i魏式系数就是> ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i如:>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i78×63,59×42pater" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i它们的系数一定是十位数大的数减去它的>位数。 >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i只要十位数差一,>位数相加为ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i11>ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i的数一律可以采用以上方法速算。 ter" ibr rargi="olght:20px;pi3 ndess= iiter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i例题 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenter"-family: 黑体enlafro: rgb(0, 204, 255})ss= i1>ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= i 76×75, ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenter"-family: 黑体enlafro: rgb(0, 204, 255})ss= i >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= i563>< ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i然后十位数上加上7最后的积为 ter" > ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i例题 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= ib 78×63, ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i计算方法: ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= i7×(6+1/=49,3×8=24 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenter"-family: 黑体enlafro: rgb(0, 204, 255})ss= i< ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i两积组成 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= i4924, ter" >ter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i然后在十位数上2减去 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= ia, ter" iter"nfnbs="黑体ss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255})ss= i最后的积为 ter" >ter"nfnbs="ard?poptCodss= rargi="olght:20px;pi3 ndenlafro: rgb(0, 204, 255)ess= i4914 ter" > ter" >p align="centerss= rargi="olght:20px;pi23nde height : nde ecorahtmlnt: 2emess= idter"nfnbs="黑体ss= rargi="olght:20px;pi23ndess= iiter"nrpx;="4ss= rargi="olght:20px;pi3 ndess= idltrong rargi="olght:20px;pi3 ndess= iiter"nlafro="#ffff0ght= rargi="olght:20px;pi3 ndess= i >wbr rargi="olght:20px;pi3 ndess= ii ter" > ter" >< ip align="centerss= rargi="olght:20px;pi23nde height : ndess= iiltrong rargi="olght:20px;pi23ndess= iiter"nlafro="#ffff00ss= rargi="olght:20px;pi23ndess= ii ter" > i div s= idiv> i div idiv s= idiv >
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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