Question

Giúp em c3 với ạ!

Answer 1

3.\(A=\left(\dfrac{x-4}{\sqrt{x}-2}+\dfrac{x-2\sqrt{x}}{\sqrt{x}}\right):\sqrt{x}\)

\(=\left(\dfrac{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}{\sqrt{x}-2}+\dfrac{\sqrt{x}\left(\sqrt{x}-2\right)}{\sqrt{x}}\right).\dfrac{1}{\sqrt{x}}\)

\(=\left(\sqrt{x}+2+\sqrt{x}-2\right).\dfrac{1}{\sqrt{x}}=2\sqrt{x}.\dfrac{1}{\sqrt{x}}=2\)

Answer 2

Tham Khảo!!!

\(3.A=\left(\dfrac{x-4}{\sqrt{x-2}}+\dfrac{x-2\sqrt{x}}{\sqrt{x}}\right):\sqrt{x}\)

\(=\left(\dfrac{\sqrt{x-2}.\sqrt{x+2}}{\sqrt{x-2}}+\dfrac{\sqrt{x}\left(\sqrt{x-2}\right)}{\sqrt{ }}x\right).\dfrac{1}{\sqrt{x}}\)

\(=\left(\sqrt{x}+2+\sqrt{x}-2\right).\dfrac{1}{\sqrt{x}}\)

\(=2\sqrt{x}.\dfrac{1}{\sqrt{x}}\)

\(=2\)