1/2（x-2)²+x-2=0
(x-2)^2+2(x-2)=0
(x-2)(x-2+2)=0
x(x-2)=0
x1=0,x2=2
1/3(x-4)²=3
(x-4)^2-9=0
(x-4+3)(x-4-3)=0
(x-1)(x-7)=0
x1=1,x2=7