Tập xác định của hàm số
là:
A.
,
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095134817_images/obj20195619674417989095134817_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095134817_images/obj20195619674417989095134817_img2.png)
B.
,
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095215268_images/obj20195619674417989095215268_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095215268_images/obj20195619674417989095215268_img2.png)
C.
,
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095692172_images/obj20195619674417989095692172_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095692172_images/obj20195619674417989095692172_img2.png)
D.
,
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095453685_images/obj20195619674417989095453685_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095453685_images/obj20195619674417989095453685_img2.png)
Đáp án và lời giải
Đáp án:A
Lời giải:Phân tích:
Hàm số đã cho xác định khi ![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img2.png)
,
.
Vậy TXĐ:
,
.
Vậy đáp án đúng là A.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img3.png)
![img4](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img4.png)
![img5](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img5.png)
![img6](https://cungthi.online/upload/questionbank3/eduquestion/20195619674417989095/obj20195619674417989095980047_images/obj20195619674417989095980047_img6.png)