原式=2(x+3)/(x-2)²*(x-2)/x(x+3)-1/(x-2)
=2/x(x-2)-x/x(x-2)
=-(x-2)/x(x-2)
=-1/x
[（2x+6）/(x^2-4x+4)]×[(x-2)/(x^2+3x)]-1/x-2化简!
[（2x+6）/(x^2-4x+4)]×[(x-2)/(x^2+3x)]-1/x-2化简!
数学人气：309 ℃时间：2020-03-28 19:25:00
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