Question

Rút gọn b thức

B=\(\dfrac{\sqrt{ab}-2\sqrt{b^2}}{b}\)-\(\sqrt{\dfrac{a}{b}}\)

Answer 1

\(=\dfrac{\sqrt{b}\left(\sqrt{a}-2\sqrt{b}\right)}{b}-\dfrac{\sqrt{a}}{\sqrt{b}}=\dfrac{\sqrt{a}-2\sqrt{b}-\sqrt{a}}{\sqrt{b}}=-\dfrac{2\sqrt{b}}{\sqrt{b}}=-2\)