Jawabanmu

2014-01-20T21:48:33+07:00
1.9x^2-6x+1=0
x^2-6x+9=0
(x-3)(x-3)=0
x=3
2.2x^2-3x+1
x^2-3x+2=0
(x-2)(x-1)=0
x=2,x=1
3.(x-1)(x-1)-x+1=0
X^2-3x+2=0
(x-2)(x-1)=0
x=2,x=1