(x-1)^2-2(x-1)(2y-1)+(2y-1) = [ x-1 - (2y-1)]2 = ( x-1-2y+1)2 = ( x-2y)2
mk chỉnh lại đề
\(\left(x-1\right)^2-2\left(x-1\right)\left(2y-1\right)+\left(2y-1\right)^2\)
\(=\left[\left(x-1\right)-\left(2y-1\right)\right]^2\)
\(=\left(x-2y\right)^2\)
p/s: chúc bạn học tốt