Cho hàm số
có bảng biến thiên như hình vẽ. Hỏi đồ thị hàm số đã cho có bao nhiêu đường tiệm cận?
A. A:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623450727_images/obj20204607907822958623450727_img1.png)
B. B:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623540839_images/obj20204607907822958623540839_img1.png)
C. C:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623748333_images/obj20204607907822958623748333_img1.png)
D. D:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623810387_images/obj20204607907822958623810387_img1.png)
Đáp án và lời giải
Đáp án:A
Lời giải: Ta có
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img2.png)
là tiệm cận đứng của đồ thị hàm số.
,
không phải là tiệm cận đứng của đồ thị hàm số.
là tiệm cận ngang của đồ thị hàm số.
Vậy đồ thị hàm số có
đường tiệm cận.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img5.png)
![img6](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img6.png)
![img7](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img7.png)
![img8](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img8.png)
![img9](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20204607907822958623/obj20204607907822958623250097_images/obj20204607907822958623250097_img9.png)