Cho a,b,c là các số thực dương thỏa mãn điều kiện abc<=1. CMR: a(1-b^3)/b^3 + b(1-c^3)/c^3 + c(1-a^3)/a^3 >=0 CÁC BẠN GIÚP MÌNH VỚI

tinh trung bình cộng của 3 sô: 30,90,60

“Mẹ giã gạo, mẹ nuôi bộ đội Nhịp chày nghiêng, giấc ngủ em nghiêng.” (Trích “Khúc hát ru những em bé lớn trên lưng mẹ”- Nguyễn Khoa Điềm) Em hiểu câu thơ: “Nhịp chày nghiêng, giấc ngủ em nghiêng.” như thế nào?

14. Due to the pilot's…………………, the copilot managed to land safelyGUIDE 15. It's important to also see the less………………… sides of the job. DESIRE 16. I was surprised at his………………… to give up. REFUSE 17. Children are by nature………………….. of danger. AWARE 18. She is always……………. towards her parents. RESPECT 19. The hospital has the best medical……………. and fast ambulances. EQUIP 20. You can relax in the comfortable………………….. of the hotel. SURROUND 21. The…………………….. looked dark and there were hardly any other guests. ENTER 22. Artists must be…………………., otherwise they just repeat what they see or hear. CREATE 23. Why are you so……………… of his work? He's just doing his best. CRITIC 24. Have you made up your mind? We need to know your …………as soon as possible. DECIDE 25. He's too shy to look people …………………… when he talks to them. DIRECT 26. Have they put the Christmas………………….. yet? DECORATE 27. They put too many unnecesary ……………………… in food. ADD 28. I ……………… think that there's no point in arguing with him. Just ignore him. HONEST 29. Extraterretsrial life has not been…………………. proved yet. 30. Why don't you call the …………………. if the lights don't work? ELECTRIC 31. Music and television are forms of…………………ENTERTAIN 32. The concert didn't live up to our………………… EXPECT 33. The electric company admitted their ………………… for the blackout. RESPOND 34. Did you use to have …………………… as a child? ALLOW 35. I don't like those trousers, no matter how …………………….. they are. FASHION 36. Life ……………….. varies according to country and gender. EXPECT

vì sao = 16,5 vậy??? bài 13.10 sbt vật lý

mong các bn lm nhanh mik cần gấp

Tìm chữ số tận cùng của A biết : A = 23*24*25*26*27*28*29-2021

CMRL $\sqrt[3]{3+\sqrt[3]{3}}$ + $\sqrt[3]{3-\sqrt[3]{3}}$ $\leq$ 2$\sqrt[3]{3}$

Cho a, b, c là 3 số thực dương thỏa mãn a + b + c = abc . Chứng minh rằng (1 + √1+ a^2)/a + (1 + √1+b^2)/b + (1 + √1+c^2)/c ≤ abc

Với a là số nguyên,biểu thức A=a^4+2a^3+3a^2+2a+1 có phải là số chính phương ko ? Vì sao?