Biết
. Tính
theo
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20192828889817601404/obj20192828889817601404601404_images/obj20192828889817601404601404_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20192828889817601404/obj20192828889817601404601404_images/obj20192828889817601404601404_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20192828889817601404/obj20192828889817601404601404_images/obj20192828889817601404601404_img3.png)
A.
B.
C.
D.
Đáp án và lời giải
Đáp án:A
Lời giải:
Phân tích: .
Vậy đáp án đúng là A.