a: \(P=\dfrac{x^2+2x+1-x^2+2x-1+x^2-4x-1}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{x+2017}{x}\)
\(=\dfrac{x^2-1}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{x+2017}{x}=\dfrac{x+2017}{x}\)
b: Khi x=2 thì P=2019/2
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