Cho lim x suy ra 1 ((f(x) - 4) / (x - 1)) = 2. Tính lim x suy ra 1 3f(x)
Cho \(\mathop {\lim }\limits_{x \to 1} \frac{{f\left( x \right) - 4}}{{x - 1}} = 2\). Tính:
\(\mathop {\lim }\limits_{x \to 1} 3f\left( x \right)\).
Ta có \(\mathop {\lim }\limits_{x \to 1} 3f\left( x \right)\)\( = \mathop {\lim }\limits_{x \to 1} 3.\mathop {\lim }\limits_{x \to 1} f\left( x \right) = 3.4 = 12\).