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巧算1/1×2+1/2×3+1/3×4+…1/49×50
人气:427 ℃ 时间:2020-04-17 09:29:00
解答
1/1×2+1/2×3+1/3×4+…1/49×50
=1-1/2+1/2-1/3+…+1/49-1/50
=1-1/50
=49/50
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