x²-6x+9+x²-4x+4=252x²-10x+13=252x²-10x-12=0x²-5x-6=0(x-6)(x+1)=0x1=6,x2=-1
解:x平方-6x+9+x平方-4x+4=252x平方-10x-12=0(2x+2)(x-6)=02x+2=0,2x=-2,x=-1x-6=0,x=6
x²-6x+9+x²-4x+4=252x²-10x-12=0x²-5x-6=0(x-6)(x+1)=0x=6 x=-1