1/30+1/42+1/56+1/72简便算法是?
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1/30+1/42+1/56+1/72简便算法是?1/30+1/42+1/56+1/72简便算法是?1/30+1/42+1/56+1/72简便算法是?1/30+1/42+1/56+1/72=1/5*6
1/30+1/42+1/56+1/72简便算法是?
1/30+1/42+1/56+1/72简便算法是?
1/30+1/42+1/56+1/72简便算法是?
1/30+1/42+1/56+1/72
=1/5*6+1/6*7+1/7*8+1/8*9
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/5-1/9
=9/45-5/45
=4/45
1/30+1/42+1/56+1/72
=1/(5×6)+ 1/(6×7)+ 1/(7×8) + 1/(8×9)
=1/5 - 1/6 + 1/6 -1/7 +1/7 - 1/8 + 1/8 -1/9
=1/5 - 1/9
= 4/45
1/12+1/20+1/30+1/42+1/56+1/72 怎么简算?
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=?