(x-1)²+2x(x-1)=0
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(x-1)²+2x(x-1)=0(x-1)²+2x(x-1)=0(x-1)²+2x(x-1)=0(x-1)²+2x(x-1)=0(x-1)【(x-1)+2x】=
(x-1)²+2x(x-1)=0
(x-1)²+2x(x-1)=0
(x-1)²+2x(x-1)=0
(x-1)²+2x(x-1)=0
(x-1)【(x-1)+2x】=0
(x-1)（3x-1）=0
x1=1 x2=1/3