2(x-3)²=9-x²2(x-3)²+(x²-9)=02(x-3)²+(x+3)(x-3)=0(x-3)(2x-6+x+3)=0(x-3)(3x-3)=0x=3或者x=1
2(x-3)^2=9-x^22(x-3)^2+(x^2-9)=02(x-3)^2+(x+3)(x-3)=0(x-3)(2x-6+x+3)=0(x-3)(3x-3)=03(x-3)(x-1)=0x=3或x=1