原式=1-1/2+1/2-1/3+……+1/2004-1/2005
=2004/2005
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2004*2005=?
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2004*2005=?
数学人气：888 ℃时间：2019-10-29 23:04:22
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