第1个回答 2019-06-09
1/2 ＋1/6+1/12+……+1/90+1/110
=（1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/9-1/10)+(1/10-1/11)
=1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10+1/10-1/11
=1-1/11
=10/11本回答被网友采纳
=（1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/9-1/10)+(1/10-1/11)
=1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10+1/10-1/11
=1-1/11
=10/11本回答被网友采纳
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