Question

Giải giúp em 4 câu cuối với ạ Em cảm ơn

Answer 1

18) Ta có: \(H=\dfrac{x^2+\sqrt{x}}{x-\sqrt{x}+1}-\dfrac{2x+\sqrt{x}}{\sqrt{x}}\)

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

\(=x+\sqrt{x}-2\sqrt{x}+1\)

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

19) Ta có: \(T=\dfrac{a-3\sqrt{a}-4}{\sqrt{a}+1}\)

\(=\dfrac{\left(\sqrt{a}-4\right)\left(\sqrt{a}+1\right)}{\sqrt{a}+1}\)

\(=\sqrt{a}-4\)