求解小学数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
求解小学数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
数学人气:207 ℃时间:2019-08-18 02:52:57
优质解答
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)+(1/10-1/11)=1-1/11=10/11
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