(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?_数学解答

(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?

人气：449 ℃　时间：2020-05-13 23:09:38

解答

(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)