1/2+1/6+1/12...越快越好!
4个回答
原式=1*1/2+1/2*1/3+1/3*1/4+1/4*1/5.+1/10*1/11
=1-1/2+1/2-1/3+1/3-1/4.+1/10-1/11
=1-1/11
=10/11
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