30/1+42/1+56/1+72/1+90/1=?请写出主要过程.错了.应该是1/30+1/42+1/56+1/72+1/90=?
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30/1+42/1+56/1+72/1+90/1=?请写出主要过程.错了.应该是1/30+1/42+1/56+1/72+1/90=?
30/1+42/1+56/1+72/1+90/1=?
请写出主要过程.
错了.
应该是1/30+1/42+1/56+1/72+1/90=?
30/1+42/1+56/1+72/1+90/1=?请写出主要过程.错了.应该是1/30+1/42+1/56+1/72+1/90=?
是1/30+1/42+1/56+1/72+1/90吧
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
=1/10
是输入错了吗?这不就是
30+42+56+72+90=290吗??
不会吧?这个还需要过程么?直接相加啊。
290
1/30+1/42+1/56+1/72+1/90
=1/5-1/6+1/6-1/7+1/7+1/8+1/8-1/9+1/9-1/10
=2/10-1/10
=1/10
是1/30+1/42+1/56+1/72+1/90吧等于1/10
=84/2520+60/2520+45/2520+35/2520+28/2520
=252/2520
=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=?