(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
问题描述：
(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
答
(2x-6)/(x²-4）/(X+3)*( x²+x-6)/(3-x)
=2（x-3）/[(x+2)(x-2)(x+3)] *(x+3)(x-2)/(3-x)
=-2/(x+2)