2/(x-2)+mx/(x²-4)=3/(x+2)2(x+2)/(x-2)(x+2) + mx/(x-2)(x+2)=3(x-2)/(x-2)(x+2)2(x+2)+mx=3(x-2)2x+4+mx=3x-6 (1-m)x=10 m=(x-10)/xx=2时 m=-4x=-2时 m=6
