Cho Lim f(x) = 1; lim g(x)= - 2. Giá trị

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Cho \(\mathop {\lim }\limits_{x \to {x_0}} f\left( x \right) = 1,\,\mathop {\lim }\limits_{x \to {x_0}} g\left( x \right) = - 2\), Giá trị \(\mathop {\lim }\limits_{x \to {x_0}} \left[ {2f\left( x \right) - 3g\left( x \right)} \right]\) bằng

\[12\].

\[8\].

\[4\].

\[ - 4\].

Giải thích

Chọn B

\(\mathop {\lim }\limits_{x \to {x_0}} \left[ {2f\left( x \right) - 3g\left( x \right)} \right] = 2\mathop {\lim }\limits_{x \to {x_0}} f\left( x \right) - 3\mathop {\lim }\limits_{x \to {x_0}} g\left( x \right) = 2.1 - 3.\left( { - 2} \right) = 8\)