Lim 4/ 2x + 4 bằng
Giải thích
Chọn B
Ta có: \(\left\{ \begin{array}{l}4 > 0\\\mathop {\lim }\limits_{x \to - 2} 2x + 4 = 0\\2x + 4 < 0\,,\,\,\,\,\,\,khi\,x < - 2\end{array} \right.\)
\( \Rightarrow \mathop {\lim }\limits_{x \to - {2^ - }} \frac{4}{{2x + 4}} = - \infty \)