1/30+1/42+1/56+1/72+1/90 怎么用简便方法计算

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1/30+1/42+1/56+1/72+1/90怎么用简便方法计算1/30+1/42+1/56+1/72+1/90怎么用简便方法计算1/30+1/42+1/56+1/72+1/90怎么用简便方法计算1

1/30+1/42+1/56+1/72+1/90 怎么用简便方法计算
1/30+1/42+1/56+1/72+1/90 怎么用简便方法计算

1/30+1/42+1/56+1/72+1/90 怎么用简便方法计算
1/30+1/42+1/56+1/72+1/90
=1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)
=1/5-1/10
=0.1

1/30+1/42+1/56+1/72+1/90 1/30+1/42+1/56+1/72+1/90 1/30+1/42+1/56+1/72 简算 1/30+1/42+1/56+1/72简便算法 1/30+1/42+1/56+1/72＝简算1/30+1/42+1/56+1/72＝? 1/30+1/42+1/56+1/72= 30分之1+42分之一+56分之1+72分之一 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/12+1/20+1/30+1/42+1/56+1/72+1/90 1/12+1/20+1/30+1/42+1/56+1/72+1/90 1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算 1/2+1/6+1/20+1/30+1/42+1/56+1/72等于多少? 1/2+1/6+1/20+1/30+1/42+1/56+1/72等于几? 1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/12+1/20+1/30+1/42+1/56+1/72+1/90=? 1/6+1/12+1/20+1/30+1/42+1/56+1/72=?