Question

  Giúp mình bài 4,5,6 với

Answer 1

Bài 5: 

a: \(=\dfrac{10\sqrt{15}\cdot3\sqrt{15}}{75\sqrt{2}\cdot6\sqrt{2}}=\dfrac{30}{450}\cdot\dfrac{15}{2}=\dfrac{1}{15}\cdot\dfrac{15}{2}=\dfrac{1}{2}\)

b: \(=3\sqrt{3}\left(\sqrt{5}-\sqrt{3}\right)=3\sqrt{15}-9\)

c: \(=\dfrac{\sqrt{x}\left(\sqrt{x}+\sqrt{y}\right)}{\sqrt{x}+\sqrt{y}}=\sqrt{x}\)

d: \(=\dfrac{x-2}{\left|x-2\right|}=\pm1\)