\(2x^2+y^2-3xy+3x-2y+1=0\)
\(2,25x^2-2.1,5.x\left(y-1\right)+\left(y-1\right)^2-0,25x^2=0\)
\(\left(1,5x-y+1\right)^2-\left(0,5x\right)^2=0\)
\(\left(1,5x-y+1-0,5x\right)\left(1,5x-y+1+0,5x\right)=0\)
\(\left(x-y+1\right)\left(2x-y+1\right)=0\)
Đề bài là j thì b tự lm nhé~