1又1/3-7/12+9/20-11/30+13/42-15/56+17/72=?

1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72
1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8+1\/8+1\/9 =1+1\/9 =1又9分之1

1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72
1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 10 1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72,求详解啊,跪了,我没赏金啊简算... 1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72,求详解啊,跪了,我没赏金啊简算 展开  我来答 1个回答 #热议# 职场上受委屈要不要为自己解...

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

1又 1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72简便计算,
裂项法：1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8+1\/8+1\/9 =1+1\/9 =1又1\/9

1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72=( )
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）+（1\/8+1\/9)=10\/9

1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72=?
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =1+1\/3-(3+4)\/12+(4+5)\/20-(5+6)\/30+(6+7)\/42-(7+8)\/56+(8+9)\/72 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8+1\/8+1\/9 =1+1\/9 =10\/9 ...

1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72-19+90=简便计算
裂项法：1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72-19\/90 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8+1\/8+1\/9-1\/9-1\/10 =1-1\/10 =9\/10

计算1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72的简便方法算出结果
1+1\/3-7\/12+9\/20-11\/30+13\/42-15\/56+17\/72 =1+1\/3-1\/3-1\/4+1\/4+1\/5-1\/5-1\/6+1\/6+1\/7-1\/7-1\/8+1\/8+1\/9 =1+1\/9 =1又1\/9

1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56的简便计算
1又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 或者1+1\/3-(1\/3+1\/4)+(1\/4+1\/5)-(1\/5+1\/6)+(1\/6+1\/7)-(1\/7+1\/8)=7\/8 可以这样哦！

(技巧题)计算:1又1\/3-7\/12+9\/20-11\/30+13\/42-15\/56.
1又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