Cho
,
. Biểu thức biểu diễn
theo
là:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185401586415710531/obj20185401586415710531140580_images/obj20185401586415710531140580_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185401586415710531/obj20185401586415710531140580_images/obj20185401586415710531140580_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185401586415710531/obj20185401586415710531140580_images/obj20185401586415710531140580_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185401586415710531/obj20185401586415710531140580_images/obj20185401586415710531140580_img4.png)
A.
.
B.
.
C.
.
D.
.
Đáp án và lời giải
Đáp án:D
Lời giải:
Ta có: nên
Do đó:
Đáp án đúng là D.