Question

help!!

 

Answer 1

Lời giải:

3. $=6\sqrt{3}-4\sqrt{3}+3\sqrt{3}=(6-4+3)\sqrt{3}=5\sqrt{3}$

4. $=5\sqrt{3}-12\sqrt{3}+\frac{11}{2}\sqrt{3}=(5-12+\frac{11}{2})\sqrt{3}$

$=\frac{-3}{2}\sqrt{3}$

5.

$=\frac{8\sqrt{3}}{3}-\frac{\sqrt{3}}{3}-\frac{4\sqrt{3}}{5}$

$=\frac{7\sqrt{3}}{3}-\frac{4\sqrt{3}}{5}=\frac{23\sqrt{3}}{15}$
6.

$=3\sqrt{3}+\frac{4\sqrt{3}}{3}-\frac{\sqrt{3}}{2}=\sqrt{3}(3+\frac{4}{3}-\frac{1}{2})=\frac{23}{6}\sqrt{3}$

7.

$=\frac{8\sqrt{5}}{5}-\frac{3\sqrt{5}}{5}-\frac{22\sqrt{5}}{5}$

$=\sqrt{5}(\frac{8}{5}-\frac{3}{5}-\frac{22}{5})=\frac{-17}{5}\sqrt{5}$