Cho khối chóp
có các điểm
,
,
lần lượt thuộc các cạnh
,
,
thoả
,
,
. Biết thể tích khối chóp
bằng ![img12](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img12.png)
. Tìm thể tích khối chóp
.
![img1](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img3.png)
![img4](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img4.png)
![img5](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img5.png)
![img6](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img6.png)
![img7](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img7.png)
![img8](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img8.png)
![img9](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img9.png)
![img10](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img10.png)
![img11](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img11.png)
![img12](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img12.png)
![img13](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img13.png)
![img14](https://cungthi.online/upload/questionbank3/eduquestion/2019543176303298308/obj2019543176303298308716023_images/obj2019543176303298308716023_img14.png)
A.
.
B.
.
C.
.
D.
.
Đáp án và lời giải
Đáp án:D
Lời giải:
Phân tích:
Áp dụng tỉ lệ thể tích ta có: .
Vậy đáp án đúng là D.