(2x-1)²-x²=0（2x-1+x）（2x-1-x）=0(3x-1)(x-1)=0x1=1/3 x2=1x²-6x+9=(5-2x)² (x-3)²-(5-2x)²=0(x-3+5-2x)(x-3-5+2x)=0(2-x)(3x-8)=0x1=2 x2=8/3