两边乘(x-1)(x+2)x(x+2)-(x-1)(x+2)=m增根即分母为0(x-1)(x+2)=0x=1,x=-2x=1代入x(x+2)-(x-1)(x+2)=mm=3x=-2代入x(x+2)-(x-1)(x+2)=mm=0所以m=3,m=0
