(4x-1)(5x+7)=0 x1=1/4 x2=-7/5
x^2=根号5x x^2-根号5x=0 x(x-根号5)=0 x1=0 x2=根号5
3x(x-1)=2(1-x) 3x(x-1)+2(x-1)=0 (x-1)(3x+2)=0 x1=1 x2=-2/3
(x+1)^2-25=0 (x+1-5)(x+1+5)=0 (x-4)(x+6)=0 x1=4 x2=-6
2(x-3)=x^2-9 2(x-3)-(x-3)(x+3)=0 (x-3)(2-x-3)=0 x1=3 x2=-1
3x(x-1)=2(x-1) (x-1)(3x-2)=0 x1=1 x2=2/3