1) \(1-2.\left(x-2\right)+\left(x-2\right)^2\)
\(=1-2x+4+\left(x^2-2.x.2+2^2\right)\)
\(=1-2x+4+x^2-4x+4\)
\(=x^2-6x+9\)
\(=\left(x-3\right)^2\)
2) \(4.\left(x+y\right)^2-4.\left(x+y\right)+1\)
\(=4.\left(x^2+2xy+y^2\right)-4x-4y+1\)
\(=4.x^2+8xy+4y^2-4x-4y+1\)
\(=4.\left(x^2+xy+y^2-x-y+\frac{1}{4}\right)\)