1/2+1/6+1/12+1/30+42/1+56/1 简便方法,快

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1/2+1/6+1/12+1/30+42/1+56/1简便方法,快1/2+1/6+1/12+1/30+42/1+56/1简便方法,快1/2+1/6+1/12+1/30+42/1+56/1简便方法,快1

1/2+1/6+1/12+1/30+42/1+56/1 简便方法,快
1/2+1/6+1/12+1/30+42/1+56/1 简便方法,快

1/2+1/6+1/12+1/30+42/1+56/1 简便方法,快
1/2+1/6+1/12+1/30+1/42+1/56
=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8