第1个回答 推荐于2016-12-02
1/2+1/6+1/12+...+1/90+1/110+1/132
=1/(1*2)+1/(2*3)+1/(3*4)+...+1/(10*11)+1/(11*12)
=1-1/2+1/2-1/3+1/3-1/4+...+1/10-1/11+1/11-1/12
=1-1/12
=11/12本回答被提问者和网友采纳
=1/(1*2)+1/(2*3)+1/(3*4)+...+1/(10*11)+1/(11*12)
=1-1/2+1/2-1/3+1/3-1/4+...+1/10-1/11+1/11-1/12
=1-1/12
=11/12本回答被提问者和网友采纳
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