16-x^2/x^2-2x-3÷1^2-5x+4/x-3

问题描述:

16-x^2/x^2-2x-3÷1^2-5x+4/x-3

16-x^2/x^2-2x-3÷1^2-5x+4/x-3
=(16-x²)/(x-3)(x+1)×(x-3)/(x-1)(x-4)
=-(x+4)/(x²-1)
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