Tính
, kết quả là:
A.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202034135517915626783/image202034135517915626783868205_images/image202034135517915626783868205_img1.png)
B.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202034135517915626783/image202034135517915626783896262_images/image202034135517915626783896262_img1.png)
C.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202034135517915626783/image202034135517915626783499809_images/image202034135517915626783499809_img1.png)
D.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/202034135517915626783/image202034135517915626783248796_images/image202034135517915626783248796_img1.png)
Đáp án và lời giải
Đáp án:C