（1）x(x+5)=0x1=0，x2=-5(2) (x-1)(x-6)=0x1=1,x2=6(3)(x-2)²-2(x-2)=0(x-2)(x-2-2)=0(x-2)(x-4)=0x1=2,x2=4(4) 2(x²-2x+1)=32(x-1)²=3(x-1)²=3/2x-1=±√6 /2x=1±√6 /2
