原式=2x/(x+3)(x-3)+1/扰宏毁(x-3)-2/(x+3)²
=(2x²缓备+6x+x²+6x+9-2x+6)/(x+3)²(x-3)
=(3x²+10x+15)/绝扒(x+3)²(x-3)
(2x/(x²帆握慎-9))+(1/(3-x)皮基)-(2/(x²+6x+9))
=(2x)/(x+3)(x-3)-(x+3)/(x+3)(x-3)-2/(x+3)²
=(x-3)/(x²-9)-2/(x+3)²
=1/(x+3)-2/(x+3)²
=(x+3-2)/(x+3)²态敬
=(x+1)/(x+3)²
原等式=2x/陵晌拆谨如(x+3)(x-3)-1/(x-3)-2/(x+3)^2
=[2x(x+3)-(x+3)^2-2(x-3)]/(尺枣x+3)^2(x-3)
=[x^2-2x-3]/(x+3)^2(x-3)