(3-x)²+x²=9,(x-3)²+(x-3)(x+3)=0(x-3)(x-3+x+3)=0x(x-3)=0x=0或x=3（3x-1)²=4（1-x）²,（3x-1)²-[2（1-x）]²=0(3x-1+2-2x)(3x-1+2x-2)=0(x+1)(5x-3)=0x=-1或x=3/5√2（x-1)...