Giups mình giải bài này với Cho xy+yz+zx=12 (x;y;z là các số thực dương). Gía trị nhỏ nhất của biểu thức P= $x^{4}$ + $y^{4}$ + $z^{4}$ ?

Trả lời giúp mình Tiện thể kím ny để giúp giải bài tập nha

: Cuối HK II lớp 6B có 35 học sinh gồm 3 loại: Giỏi, Khá và Trung bình. Trong đó số học sinh Giỏi bằng 40% số học sinh cả lớp. Số học sinh Khá bằng 9/7 số học sinh Giỏi. Tính số học sinh Trung bình của lớp 6B? (2đ)

Ex2.Choose the suitable options to complete the following sentences. (Lựa chọn những phương án phù hợp để hoàn thành các câu sau.) 6. We have finished/finished our homework already. Can we go outside now? 7. When he has been/was 10 years old, he went to school in New York. 8. Suzy hasn't read/read the third book in the series yet. 9. Have you ever met/Did you ever meet the new mentor before? 10. What have you done/did you do so far with that non-profit organization? 11. Did they offer coupons for free pizza in Royal City last week? - Yes, they have./Yes, they did. Ex3.Decide whether the following sentences are Correct or Incorrect in terms of grammar.(Hãy xác định những câu dưới đây là Đúng hay Sai về mặt ngữ pháp.) 12. Have you ever worked as a volunteer? 13. I have cleaned up my room last week. 14. I have stayed in San Francisco for two years. 15. Did she never used public transport? 16. Last month, we started a community garden project. 17. Yesterday, I've gone to the nursing home to visit my grandfather. 18. She hasn't finished her work yet. 19. Hey Tom! Did you cook a meal at a shelter for homeless people last week? 20. They raised 20 million dong for the fund so far.

Question 36. [VD] Rewrite these statements as reported speech with tense changes. “I’ll see you here next Friday,” Tom said to me. A. Tom told to me that he will see you here next Friday. B. Tom told me that he would see me there the following Friday. C. Tom said to me that he would see you here the following Friday. D. Tom told me that he would see me there next Friday. Question 28. [NB] Choose the best option A, B, C, or D to complete each sentence. I can’t hear your voice __________ I’m wearing an earplug. A. although B. due C. however D. because Question 29. [TH] Choose the best option A, B, C, or D to complete each sentence. What would you do if a factory in your neighborhood __________ untreated water into the river? A. dump B. dumped C. dumping D. dumps Question 30. [NB] Find a mistake in each sentence by circling A, B, C, or D. Nam asked (A) his friends (B) when they (C) had went (D) to school the day before. A. asked B, friends C. they D. went Question 31. [NB] Find a mistake in each sentence by circling A, B, C, or D. Mount (A) Sinabung in (B) Indonesia eruptes (C) again two days (D) ago. A. Mount B. in C. eruptes D. days Question 32. [TH] Find a mistake in each sentence by circling A, B, C, or D. Kien said (A) that (B) he has missed (C) the train (D). A. said B. that C. has missed D. train

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Tìm em đáp án với ạ em cảm nhiều ạ

Question 30. [NB] Find a mistake in each sentence by circling A, B, C, or D. Nam asked (A) his friends (B) when they (C) had went (D) to school the day before. A. asked B, friends C. they D. went Question 31. [NB] Find a mistake in each sentence by circling A, B, C, or D. Mount (A) Sinabung in (B) Indonesia eruptes (C) again two days (D) ago. A. Mount B. in C. eruptes D. days Question 32. [TH] Find a mistake in each sentence by circling A, B, C, or D. Kien said (A) that (B) he has missed (C) the train (D). A. said B. that C. has missed D. train Question 33. [VD] Rearrange the words/ phrases given to make a complete sentence. Mark asked/ aliens/ if/ could/ others’ happiness and fear/ smell. A. Mark asked if aliens could smell others’ happiness and fear. B. Mark asked aliens if could smell others’ happiness and fear. C. Aliens asked Mark if could smell others’ happiness and fear. D. Aliens asked Mark if others’ happiness and fear could smell. Question 34. [VD] Rearrange the words/ phrases given to make a complete sentence. Trinh/ had/ asked/ Martians/ what/ to drink. A. Trinh had asked Martians what to drink. B. Trinh asked what Martians had to drink. C. Martian asked Trinh what drink had to. D. Martian had asked Trinh what drink to. Question 35. [VD] Rewrite these statements as reported speech with tense changes. “We’ve worked very hard today and it has paid off,” the students said. A. The students said we have worked very hard today and it has paid off. B. The students said they had worked very hard today and it has paid off. C. The students said they had worked very hard that day and it has paid off. D. The students said they had worked very hard that day and it had paid off.

Anh (Chị ) hãy nêu rõ và phân tích ưu điểm , hạn chế của phong trào Cần Vương cuối thế kỉ XIX

Tìm m để phương trình sau đây: $x^{3}$ - 1 - m(x - 1) = 0 có 3 nghiệm phân biệt