(x-3)²+4x(x-3)=0(x-3)[(x-3)+4x]=0(x-3)(5x-3)=0x1=3, x2=3/59(x-2)²=4(x+1)²3(x-2)=2(x+1)或3(x-2)=-2(x+1)3x-6=2x+2或3x-6=-2x-23x-2x=2+6或3x+2x=-2+6x=8或x=4/5