Cho hàm số
. Đường tiệm cận ngang của đồ thị hàm số trên là
A.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260113496_images/obj2019112287528761260113496_img1.png)
B.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260429499_images/obj2019112287528761260429499_img1.png)
C.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260175551_images/obj2019112287528761260175551_img1.png)
D.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260172616_images/obj2019112287528761260172616_img1.png)
Đáp án và lời giải
Đáp án:B
Lời giải:
,
.
Vậy
là đường tiệm cận ngang.
Vậy đáp án đúng là B.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260854079_images/obj2019112287528761260854079_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260854079_images/obj2019112287528761260854079_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/2019112287528761260/obj2019112287528761260854079_images/obj2019112287528761260854079_img3.png)