Question

Answer 1

1: Khi x=9 thì \(A=\dfrac{\left(3-1\right)^2}{3-2}=4\)

2: \(P=\dfrac{\left(\sqrt{x}-1\right)^2}{\sqrt{x}-2}\cdot\dfrac{2\sqrt{x}-2-\sqrt{x}}{x-1}\)

\(=\dfrac{\sqrt{x}-1}{\sqrt{x}+1}\)