Cho hàm số $y = f\left( x \right)$ xác định trên $\mathbb{R}\backslash \left\{ { - 1} \right\}$, liên tục các khoảng xác?
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8.png)
A.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8a.png)
B.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8b.png)
C.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8c.png)
D.
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8d.png)
Đáp án B
![](https://m.moon.vn/Images/Teachers/nguyenoanh8892/To%C3%A1n/04/1/8e.png)