1/1x3+1/3x5+1/5x7+.1/2005x2007
=1/2[(1/1-1/3)+(1/3-1/5)+(1/5-1/7)+...+(1/2005-1/2007)]
=1/2(1/1-1/2007)
=1003/2007
1/1x3+1/3x5+1/5x7+.1/2005x2007怎么算?说明思路.
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