计算题:1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42

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计算题:1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42

计算题:1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42
计算题:1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42

计算题:1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42
1/2 -1/6 - 1/12 - 1/20 - 1/30 - 1/42
=1/2 -(1/2-1/3) - (1/3-1/4) - (1/4-1/5) - (1/5-1/6) - (1/6-1/7)
=1/2 - 1/2 + 1/3 - 1/3 + 1/4 - 1/4 + 1/5 - 1/5 + 1/6 - 1/6 + 1/7
=1/7