Question

Thực hiện phép tính:

a) (\(\dfrac{6}{\sqrt{3}}\) - 2\(\sqrt{48}\)) (\(\sqrt{3}\) - 1)

b) \(\dfrac{\left(\sqrt{5}-1\right)^2}{\sqrt{5}-3}\) - \(\sqrt{9-4\sqrt{5}}\)

c) 3\(\sqrt{2a}\) - \(\sqrt{18a^3}\) + 4\(\sqrt{\dfrac{a}{2}}\) - \(\dfrac{1}{4}\)\(\sqrt{128a}\) với a \(\ge\) 0

Answer 1

a: =(2căn 3-8căn 3)(căn 3-1)

=-6căn 3*(căn 3-1)

=-18+6căn 3

b: \(=\dfrac{6-2\sqrt{5}}{\sqrt{5}-3}-\sqrt{5}+2\)

=-2-căn 5+2=-căn 5

c: \(=3\sqrt{2a}-3a\sqrt{2a}+2\sqrt{2a}-\dfrac{1}{4}\cdot8\sqrt{2a}\)

=\(3\sqrt{2a}-3a\cdot\sqrt{2a}\)