Cho lim x suy ra 3 f(x) = 4, chứng minh rằng: lim x suy ra 3 3f(x) = 12
Cho\(\mathop {\lim }\limits_{x \to 3} f\left( x \right) = 4\), chứng minh rằng:
\(\mathop {\lim }\limits_{x \to 3} 3f\left( x \right) = 12\);
\(\mathop {\lim }\limits_{x \to 3} 3f\left( x \right) = \mathop {\lim }\limits_{x \to 3} 3.\mathop {\lim }\limits_{x \to 3} f\left( x \right) = 3.4 = 12\).