(x-1)²(x-2)(x-3)=0(x-1)²=0,x=1或x-2=0,x=2或x-3=0,x=3
(x-1)²(x-2)(x-3)=0n个因式的乘积为零,则每个因式分别为零则,(x-1)²=0,或x-2=0,或x-3=0即:x=1,或x=2,或x=3.