1/6+1/12+1/30+1/42+1/56= 要简便算法,

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1/6+1/12+1/30+1/42+1/56=要简便算法,1/6+1/12+1/30+1/42+1/56=要简便算法,1/6+1/12+1/30+1/42+1/56=要简便算法,原式=1/2-1/3

1/6+1/12+1/30+1/42+1/56= 要简便算法,
1/6+1/12+1/30+1/42+1/56= 要简便算法,

1/6+1/12+1/30+1/42+1/56= 要简便算法,
原式=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/2-1/8
=3/8

1/6+1/12+1/30+1/42+1/56=
1/2-1/3+1/3-1/4+1/5-1/6+1/6-1/7+1/7-1/8
=1/2-1/4+1/5-1/8
=13/40

1/6+1/12+1/30+1/42+1/56
=1/6*1+1/6*1/2+1/6*1/5+1/6*1/7+1/6*1/8
=1/6*（1+1/2+1/5+1/7+1/8）
=1/6*551/280
=551/1680

1/6+1/12+1/20+1/30+1/42 1／6+1／12+1／20+1／30+1／42 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, 简便运算：1/2+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的简便计算 2/1+6/1+12/1+20/1+30/1+42/1+56/1=? 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+1/2+1/6+1/12+1/20+1/30+1/42=? 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