30/1+42/1+56/1+72/1+90/1=?请写出主要过程.错了.应该是1/30+1/42+1/56+1/72+1/90=?
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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=?