user-avatar
Uyen1010
2 năm trước
Cho các số dương x, y, z thoả mãn 1/xy+1/yz+1/xz = 1. Tìm giá trị lớn nhất của biểu thức Q=x/sqrt(yz(1+x^2))+y/sqrt(xz(1+y^2))+z/sqrt(xy(1+z^2))
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the word that has different pronunciation. 1. A. with B. breathe C. they D. truth 2. A. care B. share C prepare D. career 3. A. helps B. protects C. receives D. talks II. Choose the word that has different stress. 4. A. surround B. energy C. location D. appliance 5. A. wireless B. motorhome C. skyscraper D. adventure III. Choose the best option to complete the sentences. 6. The robot will ……………. of the flowers in the garden. A. take care B. take note C. be careful D. carry 7. The house will have a super smart TV to ……………. the e-mails. A. send and post B. send and receive C. get and take D. receive and get 8. I would like to have my house by ……………., so we can see the beach from my window. A. the mountains B. the city C. the sea D. the countryside 9. We also watch films ……………. smart phones. A. in B. at C. on D. to 10. “Do you think we will ……………. holiday to the Moon?” A. go B. go on C. go up D. go in 11. Our future houses will use ……………. energy, and they are very friendly to the environment. A. sun B. sunny C. solar D. lunar 12. A super smart TV will help us ……………. goods from the supermarket. A. take B. buy C. carry D. order 13. “Do you think that our houses will be ……………. space?” A. in B. on C. at D. to 14. In the future, I will live in a ……………. so that I can travel anywhere I want. A. skyscraper B. palace C. motorhome D. houseboat 15. With a smart watch, you will ……………. your friends in other countries. A. speak B. talk C. say D. contact IV. Choose the best answer that needs correction. 16. Soccer or football is most popular sport in Viet Nam. 17. We should finish our homework before play sports. 18. I have been to the beaches in Nha Trang many time with my family. 19. The Royal Palace is one of the largest palace in Europe. 20. Da Nang attracts lots of tourists so it has clean and beautiful beaches.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team