a) Ta có: \(x\left(x+xy-1\right)+\left(x-2y\right)\left(x-1\right)-2x\left(x-1\right)\)
\(=x^2+x^2y-x+x^2-x-2xy+2y-2x^2+2x\)
\(=x^2y-2xy+2y\)
\(=y\left(x^2-2x+2\right)\)
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