谢谢,请快一点! (2x^2-18)/(4-4x+x^2)/[(x+3)*(3-x)/(x^2-2x-3)]

分类: 作业答案 • 2021-12-23 14:33:31

问题描述：

答

(2x^2-18)/(4-4x+x^2)/[(x+3)*(3-x)/(x^2-2x-3)]
=2(x+3)（x-3)/(x-2)^2*(x-3)(x+1)/(x+3)(3-x)
=-2(x-3)(x+1)/(x-2)^2