Tam giác ABC nhọn có AD,BE,CF là các đường cao,H là trực tâm của tam giác ABC.Tìm điều kiện của tam giác ABC để (AB+BC+CA)^2/AD^2+BE^2+CF^2 đạt giá trị nhỏ nhất

Làm giúp em bài này vs nha!! SNT là số nguyên tố nhé

Giúp nhanh nha gần gấp lắm lun

Talk about your idol Ưu tiên Ariana Grande, Taylor Swift với Sơn Tùng Chiều nay mình cần gấp!!! Cảm ơn mọi người.

em hãy tả một người thân mà em yêu thích

Giải hộ mình nhé mình sẽ vote5 sao ngắn

vẽ số 16 ở trong 7 viên ngọc rồng

Bài 1. Tính : 1. ($\frac{2}{3}$)$^{3}$ 2. (-$\frac{2}{3}$)$^{3}$ 3. (-1$\frac{3}{4}$)$^{2}$ 4. (-$0,1)^{4}$ Bài 2. Viết số hữu tỉ $\frac{81}{625}$ dưới dạng một lũy thừa. Nêu tất cả các cách viết Bài 3. Tính : a) (-$\frac{1}{3}$)$^{2}$ . (-$\frac{1}{3}$) b) (-$2)^{2}$ . (-$2)^{3}$ c) $a^{5}$ . $a^{7}$ Bài 4. Tính : a) ($\frac{1}{7})$$^{7}$ . $7^{7}$ b) ($0,125)^{3}$ . 512 c) ($0,25)^{4}$ . 1024 Bài 5. Tính : a) $\frac{90^{3}}{15^{3}}$ b) $\frac{790^{4}}{79^{4}}$ c) $\frac{3^{2}}{(0,375^{2})}$ Giúp mình với chiều đi học rồi làm bài nào cũng được làm tất cả thì càng tốt ạ

Write an email (100-120 words) to your pen-friend anh tell him/her about your most favourite leisure activity. Giúp mình với ạ (có dịch)..Ko chép mạng ạ!

GIÚP MÌNH VỚI, ƯU TIÊN GIẢI THÍCH TẠI SAO!!!! Chọn câu trả lời đúng 11. When my father was young, he _______ work in the garden for long hours. A. can B. could C. will D. should 12. He _______ have committed the crime because he was with me that day. A. mustn't B. shouldn't C. won't D. couldn't 13. Since we have to be there by 8.30, we_______ take a taxi. A. had better B. may C. ought D. are able to 14. It _______ rain this evening. Why don't you take an umbrella? A. could be B. must C. might D. had better 15. _______ you help me with the homework? A. May B. Shall C. Should D. Will 16. She hasn't eaten anything since yesterday. She _______ be really hungry. A. might B. will C. must D. can 17. I put my keys on the table, but now it's gone. Someone _______ have taken it. A. may B. had to C. should D. would rather 18. Daisy is reading her English test because she has a test tomorrow. She _______ be studying. A. will B. should C. must D. can 19. We _______ put the fish in the fridge before it spoils. A. had to B. may C. can D. had better 20. Mr. Brown is very rich. He _______ work hard for a living. A. mustn't B. shouldn't C. can't D. doesn't have to 21. Tom has just got a new job. He _______ be very pleased. A. might B. must C. should D. will 22. Tom painted his room black. It looks dark and dreary. He _______ have chosen another color. A. should B. must C. could D. may 23. _______ you carry this bag for me? A. May B. Should C. Will D. Shall 24. You _______ throw litter on the streets. A. mustn't B. couldn't D. needn't D. won't 25. My mother permitted me to go out at night. She said, "You _______ go out tonight". A. may B. have to C. must D. ought to 26. It is possible that she _______ come to our party tonight. A. need B. ought to C. should D. will 27. They can type. They _______ type. A. lean how to B. are able to C. know how to D. both B &C 28. He advised me to take an English course. I _______ take it early. A. should B. shall C. will D. may 29. I'd rather _______ in the field than _______ home. A. to work/ to stay B. work/ stay C. working/ staying D. worked/stayed 30. As an orphan, he _______ earn his living alone. A. have to B. have had to C. ought to D. had to 31. They prayed that their daughter _______ be lucky again. A. may B. will C. could D. might 32. She _______ all that money, so she could save some. A. didn't need to spend B. needn't have spent C. shouldn't spend D. oughtn't to spend 33. He spent all that money last week. He _______ so much. A. didn't need to spend B. shouldn't spend C. needn't have spent D. didn't have to spend 34. He had to work hard so that he _______ his family. A. may support B. supported C. can support D. could support 35. They have plenty of time, so they need not _______. A. be hurry B. to hurry C. hurry D. to be hurry