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2002的2次方÷1999×2001-3
人气:499 ℃ 时间:2020-04-02 19:31:55
解答
令a=2002
则原式=a²/[(a-3)(a-1)-3]
=a²/(a²-4a+3-3)
=a²/(a²-4a)
=a/(a-4)
=2002/1998
=1001/999
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