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-(-1/1x2-1/2x3-1/3x4-1/4x5-.-1/2001x2002)
人气:149 ℃ 时间:2020-05-16 03:19:01
解答
-(-1/1x2-1/2x3-1/3x4-1/4x5-.-1/2001x2002)
=1-1/2+1/2-1/3+.+1/2001-1/2002
=1-1/2002
=2001/2002
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