Cho
ta đặt
. Mệnh đề nào dưới đây sai?
A.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202033115912678459810/image202033115912678459810930844_images/image202033115912678459810930844_img1.png)
B.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202033115912678459810/image202033115912678459810456875_images/image202033115912678459810456875_img1.png)
C.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202033115912678459810/image202033115912678459810407417_images/image202033115912678459810407417_img1.png)
D.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202033115912678459810/image202033115912678459810927909_images/image202033115912678459810927909_img1.png)
Đáp án và lời giải
Đáp án:B