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1/42+1/56+1/72+1/90+1/110+1/132=?
人气:361 ℃ 时间:2019-12-13 04:20:48
解答
1/42+1/56+1/72+1/90+1/110+1/132=?
=1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11+1/11-1/12
=1/6-1/12
=1/12
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