(1) 3x^2 -12x=-12
3x^2 -12x+12=0
3（x^2-4x+4）=0
3(x-2)^2=0
x=2
(2) 4x^2-144=0
4(x^2-36)=0
x=±6
(3) 3x(x-1)=2(x-1)
(3x-2)(x-1)=0
x=2/3 或 1
(4) (2x-1)^2=(3-x)^2
[(2x-1)+(3-x)][(2x-1)-(3-x)]=0
x=-2 或4/3