(x-3)²+2x(x-3)=0解:(x-3)【(x-3)+2x】=0(x-3)(3x-3)=0x-3=0或3x-3=0x=3或x=1
(x-3)²+2x(x-3)=0 (x-3)(x-3+2x)=0(x-3)(3x-3)=0x=3或x=1
(x-3)²+2x(x-3)=0(x-3)(x-3+2x)=0(x-3)(3x-3)=0x1=3 x2=1