Question

Giúp e với ạ

Answer 1

3.

\(2\sqrt{6}=\sqrt{24}< \sqrt{25}=5\)

\(\Rightarrow5>2\sqrt{6}\)

Answer 2

4.

\(\dfrac{1}{2}\sqrt{12}-\sqrt{7+4\sqrt{3}}\)

\(=\dfrac{1}{2}.2\sqrt{3}-\sqrt{\left(\sqrt{3}+2\right)^2}\)

\(=\sqrt{3}-\left|\sqrt{3}+2\right|\)

\(=-2\)

Answer 3

5.

\(\sqrt[3]{27}-\sqrt[3]{125}=3-5=-2\)

Answer 4

6. B