1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56=? 用递等式(能简便要简便)_百度...
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)=1-1\/8 =7\/8
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56=? 简便计算,
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56=1+(1\/3)-(1\/3)-(1\/4)+(1\/4)+(1\/5)-(1\/5)-(1\/6)+(1\/6)+(1\/7)-(1\/7)-(1\/8)=1-(1\/8)=7\/8
急1加3分之一减12分之7加20分之9减30分之11加42分之13减56分之15 用...
1-1\/3+7\/12-9\/20+11\/30-13\/42 =1-1\/3+(1\/3+1\/4)-(1\/4+1\/5)+(1\/5+1\/6)-(1\/6+1\/7)=1-1\/7 =6\/7
一又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56简便运算
原式=(1+1\/3)-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)，打开括号，相邻两项相消，原式=1-1\/8=7\/8
简算:1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-(3+4)\/12+(4+5)\/20-(5+6)\/30+(6+7)\/42-(7+8)\/56 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8 =1-1\/8=7\/8 补充(3+4）\/12=3\/12+4\/12=1\/4+1\/3 其余的都是这样算 ...
简便计算 1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8 =1-1\/8 =7\/8
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)=1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8 =1-1\/8 =7\/8
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-（1\/3+1\/4）+（1\/4+1\/5）-（1\/5+1\/6）+（1\/6+1\/7）-（1\/7+1\/8）=1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8 =1-1\/8 =7\/8 同学你好，如果问题已解决，记得右上角采纳哦~~~您的采纳是对...
计算1+3分之1-12分之7+20分之9-30分之11+42分之13-56分之15
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56=1+1\/3-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)=1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8=1-1\/8=7\/8 前后可以依次相互抵消 ~一刻永远523为你解答，祝你学习进步~~~希望可以及时...
1+3分之1-12分之7+20分之9-30分之11+42分之13-56分之15的简便算法_百度...
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56 =1+1\/3-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)=1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8 =1+(1\/3-1\/3)-(1\/4-1\/4)+(1\/5-1\/5)-(1\/6-1\/6)+(1\/7-1\/7)-1\/8 ...
