计算-1/2-1/6-1/12-1/20-……1/42
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-1/2-1/6-1/12-1/20-……1/42

=-1/2-(1/2-1/3)-(1/3-1/4)-(1/4-1/5)-.-(1/6-1/7)

=-1/2-1/2+1/3-1/3+1/4-1/4+1/5-.-1/6+1/7

=-1/2-1/2+1/7

=-1+1/7

=-6/7

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