Toán Lớp 11: Lim x đến 4 x mủ 2 – 3x – 4/ x mũ 2 – 16
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 11: Lim x đến 4 x mủ 2 – 3x – 4/ x mũ 2 – 16
Comments ( 1 )
\mathop {\lim }\limits_{x \to 4} \dfrac{{{x^2} – 3x – 4}}{{{x^2} – 16}}\\
= \mathop {\lim }\limits_{x \to 4} \dfrac{{\left( {x + 1} \right)\left( {x – 4} \right)}}{{\left( {x – 4} \right)\left( {x + 4} \right)}}\\
= \mathop {\lim }\limits_{x \to 4} \dfrac{{x + 1}}{{x + 4}} = \dfrac{{4 + 1}}{{4 + 4}} = \dfrac{5}{8}
\end{array}$