（2）(x-1)(x-1+2x)=0
(x-1)(3x-1=0
x-1=0或者3x-1=0
x=1或者x=1/3
(3) 2x^2-4x+2=3
2(x-1)^2=3
(x-1)^2=3/2
x-1=±√(3/2)
x1=√(3/2)+1 X2=1-√(3/2)
(4)-3x^2-4x+4=0 3x^2+4x-4=0 (x+2)(3x-2)=0 x=-2或者2/3
(5) 3x（x-1)=2-2x 3x^2-3x+2x-2=0 3x^2-x-2=0 (-x+1)(-3x-2)=0 x=1或者-2/3
(6)(x-1)（x+2)=70 x^2+2x-x-2=70 x^2+x-72=0 (x-8)(x+9)=0 x=8或者-9
（7）x(x+6)=7 x^2+6x-7=0 （x-1）（x+7）=0 x=1或者-7
（8）(3-x）^2+x^2=9 9-6x+x^2+x^2=9 2x^2-6x=0 2x（x-3）=0 x=0或者x=3