作业帮(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
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(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
(2x-6)/(x²-4x）/(X+3)*( x²+x-6)/(3-x)等于多少?
(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)
=2(x-3)/x(x-4)×1/(x+3)×(x+3)(x-2)/[-(x-3)]
=-2(x-2)/x(x-4)