1/30+1/42+1/56+1/72要简便运算快

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1/30+1/42+1/56+1/72要简便运算快1/30+1/42+1/56+1/72要简便运算快1/30+1/42+1/56+1/72要简便运算快计算过程为：1/5*1/6+1/6*1/7+1/7

1/30+1/42+1/56+1/72要简便运算快
1/30+1/42+1/56+1/72
要简便运算快

1/30+1/42+1/56+1/72要简便运算快
计算过程为：
1/5*1/6+1/6*1/7+1/7*1/8+1/8*1/9
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/5-1/9
=4/45
这一类的题都可以这么做

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= 1/30+1/42+1/56+1/72要简便运算快 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 1/4-1/20-1/30-1/42-1/56-1/72简便计算怎么做开学要用 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

1/30+1/42+1/56+1/72要简便运算 快