Giới hạn lim x → 1 + − 2 x + 1 x − 1 bằng

B

Ta có \(\mathop {\lim }\limits_{x \to {1^ + }} \left( { - 2x + 1} \right) =  - 1 < 0\), \(\mathop {\lim }\limits_{x \to {1^ + }} \left( {x - 1} \right) = 0\), \[x - 1 > 0\] khi \[x \to {1^ + }\].

Suy ra \(\mathop {\lim }\limits_{x \to {1^ + }} \frac{{ - 2x + 1}}{{x - 1}} =  - \infty \).