1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算
问题描述:
1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算
答
1减1/6加1/42加1/56加1/72加1/90加1/110用简便运算
=1-1/6+(1/6-1/7+1/7-1/8+...+1/10-1/11)
=1-1/11
=10/11;
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