(x-5)²=2(5-x)x²-10x+25=10-2xx²-8x+15=0(x-3)(x-5)=0x1=3,x2=5（3x-2）²-（x+1）²=09x²-12x+4-x²-2x-1=08x²-14x+3=0(4x-1)(2x-3)=0x1=1/4x2=3/2