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](/uploads/image/z/74425-49-5.jpg?t=1%2F30%2B1%2F42%2B1%2F56%2B1%2F72%2B1%2F90+%E6%80%8E%E4%B9%88%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97)
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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
1/30+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=?