作业帮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+1/90
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)
=(7+5)/(5*6*7)+(9+7)/(7*8*9)+1/(9*10)
=12/(5*6*7)+16/(7*8*9)+1/(9*10)
=2/(5*7)+2/(7*9)+1/(9*10)
=2*(9+5)/(5*7*9)+1/(9*10)
=28/(5*7*9)+1/(9*10)
=4/(5*9)+1/(9*10)
=(8+1)/(9*10)
=1/10
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=?