1/2+1/6+1/12+1/20+1/30+1/42
= 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
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计算题 1/2+1/6+1/12+1/30+1/42
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