1/2+1/6+1/12+1/20+...+1/9900
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
=1-1/100
=99/100
用简单的方法计算1/2+1/6+1/12+1/20+...+1/9900
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