Tập xác định của hàm số
là:
A.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456759516_images/obj20195619674415216456759516_img1.png)
B.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456762451_images/obj20195619674415216456762451_img1.png)
C.
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456697462_images/obj20195619674415216456697462_img1.png)
D.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456130446_images/obj20195619674415216456130446_img1.png)
Đáp án và lời giải
Đáp án:B
Lời giải:Phân tích:
Điều kiện xác định: ![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456192431_images/obj20195619674415216456192431_img1.png)
,
.
Vậy tập xác định là
.
Vậy đáp án đúng là B.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456192431_images/obj20195619674415216456192431_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456192431_images/obj20195619674415216456192431_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456192431_images/obj20195619674415216456192431_img3.png)
![img4](https://cungthi.online/upload/questionbank3/eduquestion/20195619674415216456/obj20195619674415216456192431_images/obj20195619674415216456192431_img4.png)