\(\mathop {\lim }\limits_{x \to {0^ + }} \frac{{2x + 7\sqrt x }}{{5x - \sqrt x }}\) bằng:

* Hướng dẫn giải

\(\mathop {\lim }\limits_{x \to {0^ + }} \frac{{2x + 7\sqrt x }}{{5x - \sqrt x }} = \mathop {\lim }\limits_{x \to {0^ + }} \frac{{\sqrt x \left( {2\sqrt x  + 7} \right)}}{{\sqrt x \left( {5\sqrt x  - 1} \right)}} = \mathop {\lim }\limits_{x \to {0^ + }} \frac{{2\sqrt x  + 7}}{{5\sqrt x  - 1}} =  - 7\)