20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.

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20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.
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20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.
20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.

20/1+30/1+42/1+56/1+72/1+90/1 用简便方法计算.
小同学给看下规律
1/20=1/4*1/5=1/4 - 1/5
那么原式=1/4-1/5+1/5-/6+.+1/9-1/10
=1/4 -1/10
=3/20

1/20+1/30+1/42+1/56简便计算, 1/20+1/30+1/42+1/56=1/20+1/30+1/42+1/56= 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 1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算 1/2+1/6+1/12+1/20+1/30+1/42+1/56简算, 1/12+1/20+1/30+1/42+1/56+1/72+1/90 简便运算：1/2+1/6+1/12+1/20+1/30+1/42+1/56 2/1+6/1+12/1+20/1+30/1+42/1+56/1=? 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 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算 1/2+1/6+1/12+1/20+1/30+1/42+1/56 1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少 2/1+6/1+12/1+20/1+30/1+42/1+56/1= 1/2+1/6+1/12+1/20+1/30+1/42+1/56= 1/2+1/6+1/12+1/20+1/30+1/42+1/56 1/2+1/6+1/12+1/20+1/30+1/42+1/56