(负1×1/2)+(负1/2×1/3)+(负1/3×1/4)……(负1/2012×1/2013)
= -（1×1/2+1/2×1/3+……+1/2012×1/2013）
= -（1-1/2+1/2-1/3+……+1/2012-1/2013）
= -（1-1/2013）
= -2012/2013
(负1×1/2)+(负1/2×1/3)+(负1/3×1/4)……(负1/2012×1/2013)等于多少?
(负1×1/2)+(负1/2×1/3)+(负1/3×1/4)……(负1/2012×1/2013)等于多少?
数学人气：764 ℃时间：2019-11-22 00:21:14
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