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$\underset{x\to -\infty }{\mathop{\lim }} \dfrac{2x-1}{x+2}$ bằng

Câu hỏi: $\underset{x\to -\infty }{\mathop{\lim }} \dfrac{2x-1}{x+2}$ bằng
A. $1.$
B. $-\dfrac{1}{2}.$
C. $2.$
D. $-\infty .$
Ta có: $\underset{x\to -\infty }{\mathop{\lim }} \dfrac{2x-1}{x+2}=\underset{x\to -\infty }{\mathop{\lim }} \dfrac{2-\dfrac{1}{x}}{1+\dfrac{2}{x}}=2.$
Đáp án C.
 

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