1/30+1/42+1/56+1/72简便算法

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1/30+1/42+1/56+1/72简便算法
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1/30+1/42+1/56+1/72简便算法
1/30+1/42+1/56+1/72简便算法

1/30+1/42+1/56+1/72简便算法
1/30+1/42+1/56+1/72
=（1/5-1/6）+（1/6-1/7）+（1/7-1/8）+（1/8-1/9）
=1/5-1/9
=4/45

1/30+1/42+1/56+1/72
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/5-1/9
=4/45

1/30+1/42+1/56+1/72=(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)=1/5-1/9=9/45-5/45=4/45

1/12+1/20+1/30+1/42+1/56+1/72 怎么简算? 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=?