15问答网 > 1⼀1×2 + 1⼀2×3 + 1⼀3×4 +…+1⼀2013×2014 + 1⼀2014×2015

1⼀1×2 + 1⼀2×3 + 1⼀3×4 +…+1⼀2013×2014 + 1⼀2014×2015

2025-04-04 13:33:49
推荐回答（1个）
回答1：

1/1×2 + 1/2×3 + 1/3×4 +…+1/2013×2014 + 1/2014×2015=1-1/2+1/2-1/3+1/3-1/4
......+1/2013-1/2014+1/2014-1/2015=1-1/2015=2014/2015

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