1+3+5+...+2001______________2003+2005+4003 (是分数,

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1+3+5+...+2001______________2003+2005+4003 (是分数,

1+3+5+...+2001______________2003+2005+4003 (是分数,
1+3+5+...+2001
______________
2003+2005+4003 (是分数,

1+3+5+...+2001______________2003+2005+4003 (是分数,
分子=(2001+1)×1001÷2
=1001²
分母=2002+1+2002+3+.+2002+2001
=2002×1001+(1+3+5+.+1001)
=2002×1001+1001²
=3×1001²
所以原式=1/3

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