Question

Answer 1

\(P=\dfrac{x-2}{3}\)

Answer 2

Ta có: \(P=\dfrac{x}{x+2}\cdot\dfrac{\left(x-2\right)\left(x+2\right)}{3x}\)

\(=\dfrac{x}{3x}\cdot\dfrac{\left(x-2\right)\left(x+2\right)}{x+2}\)

\(=\dfrac{x-2}{3}\)