1-1/6+1/42+1/56+1/72用简便算法

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1-1/6+1/42+1/56+1/72用简便算法
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1-1/6+1/42+1/56+1/72用简便算法
1-1/6+1/42+1/56+1/72用简便算法

1-1/6+1/42+1/56+1/72用简便算法
1/42=1/6*7=1/6-1/7
1/56=1/7*8=1/7-1/8
1/72=1/8*9=1/8-1/9
所以1-1/6+1/42+1/56+1/72=1-1/6+1/6-1/7+1/7-1/8+1/8-1/9=1-1/9=8/9

1－1/6 +1/42 +1/56 +1/72 1-1/6＋1/42+1/56+1/72 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 1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算 1-1/6+1/42+1/56+1/72+1/90+1/110怎么简便 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? 1-1/6+1/42+1/56+1/72+1/90+1/110= 1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/6+1/12+1/20+1/30+1/42+1/56+1/72=? 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1/42+1/56+1/72+1/90+1/110 1-1/6+1/42+1/56+1/72+1/90怎么计算 计算1-1/6+1/42+1/56+1/72+1/90分数