user-avatar
tinhco262
2 năm trước
CMR: $\sqrt[]{x^2+\frac{1}{x^2} }$ + $\sqrt[]{y^2+\frac{1}{y^2} }$ +$\sqrt[]{z^2+\frac{1}{z^2} }$ $\geq$ $\frac{3}{2}$ $\sqrt[]{17}$ với x+y+z $\leq$ $\frac{3}{2}$
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Choose the best answer (A, B, C or D). Q6 1 điểm Cyclist and motorist have to wear a --------------- when they ride a motorbike. A. cap B. mask C. helmet D. hard that Q7. He forgot to give a ------------ before he turned left and got a ticket. 1 điểm A. hand B. signal C. sign D. light Q8. You should walk across the street ______ the zebra crossing. 1 điểm a. on b. at c. in d. from Q9. My house is not far from my school, so I usually go ______. 1 điểm .a. on foot b. by foot c. by car d. by boat Q10. This morning, I was ______ in a traffic jam and got to school fifteen minutes late. 1 điểm a. catch b. block c. struck d. stuck Q11. Turn on the left turn ______ before you make the turn and slow down. 1 điểm a. sign b. direction c. signal d. crossing Q12. It is ______ to use a hand-held mobile phone while driving or riding. 1 điểm a. safe b. important c. illegal d. careful Q13. ______ does it take you to ride to school? – About 30 minutes. 1 điểm a. How long b. How far c. How often d. How much Q14. A ______ is a part of a road that only bicycles are allowed to use. 1 điểm a. cycle cross b. cycle lane c. cycle line d. cycle race Q15. You ______ cross the street when the light is red. 1 điểm a. should b. don’t have to c. can d. mustn’t Q16. People ______ produce as much rubbish as we do now. 1 điểm a. use to b. used to c. used to not d. didn’t use to Q17. “How far is Vung Tau from Ho Chi Minh City”-“_______” 1 điểm A. It’s not very long. b. it takes about two hours or more. c. It’s about 120km d. You can get to Vung Tau by boat or bus.

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