Phương trình
có nghiệm là
A.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857809309_images/obj2019122684647566857809309_img1.png)
B.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857806374_images/obj2019122684647566857806374_img1.png)
C.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857697866_images/obj2019122684647566857697866_img1.png)
D.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857124980_images/obj2019122684647566857124980_img1.png)
Đáp án và lời giải
Đáp án:C
Lời giải:Chọn C
ĐK
Vậy đáp án đúng là C.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img5.png)
![img6](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019122684647566857/obj2019122684647566857583488_images/obj2019122684647566857583488_img6.png)