Question

giúp i:33

a) \(\left(2\sqrt{6}-4\sqrt{3}+5\sqrt{2}-\dfrac{1}{4}\sqrt{8}\right).3\sqrt{6}\)

b) \(\dfrac{\sqrt{a}-\sqrt{b}}{a+b-2\sqrt{ab}}\)

Answer 1

a)
\(=\left(2\sqrt{6}-4\sqrt{3}+5\sqrt{2}-\dfrac{\sqrt{2}}{2}\right).3\sqrt{6}=36-36\sqrt{2}+30\sqrt{3}-3\sqrt{3}=36-36\sqrt{2}+27\sqrt{3}\)
b)
\(=\dfrac{\sqrt{a}-\sqrt{b}}{\left(\sqrt{a}-\sqrt{b}\right)^2}=\dfrac{1}{\sqrt{a}-\sqrt{b}}\)