问题标题：
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
问题描述：
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
鞠登峰回答：
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
=2（x-3)/(x-2)^2X(x+3)^2/(3-x)X(2-x)/(x+3)
=2（x-3)/(x-2)^2X(x+3)^2/(x-3)X(x-2)/(x+3)
=2(x+3)/x-2
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