Hãy thu gọn ​\(\begin{aligned} & \sqrt {\frac{1}{9}{{\left( {x + \frac{1}{2}} \right)}^2}} \left( {x...

* Hướng dẫn giải

 \(\begin{aligned} & \sqrt {\frac{1}{9}{{\left( {x + \frac{1}{2}} \right)}^2}} \\ & = \sqrt {\frac{1}{9}} .\sqrt {x + \frac{1}{2}} \\ & = \frac{1}{3}.\left| {x + \frac{1}{2}} \right|\\ & = - \frac{1}{3}\left( {x + \frac{1}{2}} \right)\left( { \text{ Do } x < - \frac{1}{2} \Rightarrow x + \frac{1}{2} < 0} \right) \end{aligned} \)