（x^2-9/x＋2）÷（x^2-6x＋9/2x＋4）-（2x/x-3）
=[(x-3)(x+3)/(x+2)]×[2(x+2)/(x-3)²]-2x/(x-3)
=2(x+3)/(x-3)-2x/(x-3)
=6/(x-3)
=6/(1-3)
=-3