tìm các số nguyên x y biết A x/y=2/5 B x/3=y/7

có ai giải được không ạ em cần câu trả lời

Giúp mình với ạ! Bài 1: Có 2 lọ thuỷ tinh, một lọ đựng khí oxi, một lọ đựng không khí. Hãy nêu cách phân biệt 2 lọ. Bài 2: Trong phòng thí nghiệm người ta điều chế oxit sắt từ Fe3O4 bằng cách dùng oxi oxi hóa sắt ở nhiệt độ cao. Tính số gam sắt và thể tích oxi cần dùng để có thể điều chế được 2,32 gam oxit sắt từ Bài 3: Viết những PTHH khi cho oxi tác dụng với: a) Đơn chất: Al, Zn, Fe, Cu, Na, C, S, P. b) Hợp chất: CO, CH4, C2H6O Bài 4: Hãy giải thích vì sao: a) Than cháy trong oxi tạo ra nhiệt độ cao hơn khi than cháy trong không khí? b) Dây sắt nóng đỏ cháy sáng trong oxi, nhưng không cháy được trong không khí?

Giải giúp mik bài 3 và bài 4 với 8h30 là mik phải nộp rồi 🙏🙏

giúp em với ạ Viết đoạn văn (200 chữ) nêu cảm nhận về vẻ đẹp của tiếng Việt

1.We try our best. We want to get good grades ( so as to )  We ____________________________________________________ 2. He put some bread on the table. The poor could get it for their family.  He _____________________________________________________________ ( in order to ) He _______________________________________________________________ ( so that )

1 ô tô đi từ A đến B mất 2h30' . Nếu nó đi với vận tốc nhỏ hơn 10km/h thì sẽ mất nhiều thời gian hơn là 50' . Tính quãng đường AB 😐ai giải hộ mình đi ạ!😊 🖒hứa sẽ vote 5sao🖐

13 Mark the letterA,B,C,or D on your answer sheet to indicate the sentence which has a similar meaning to the first one in each of the following questions. "Should I tell her the truth about her misery?" she asked herself. A: She wondered whether she tells her the truth about her misery. B: She wondered if she told her the truth about her misery. C: She wondered if tell her the truth about her misery. D: She wondered whether to tell her the truth about her misery. 14 Mark the letter A, B, C or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions. A: favourable B: adolescence C: relaxation D: concentration 15 Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. A: problem B: love C: hobby D: box 16 Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. Hoa said she was very ________ and she didn’t want to go to the cinema with us. A: tired B: quick C: smoothly D: fast 17 Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. Nga’s dream is to be a ________, but her parents want her to be a medical doctor. A: musical B: musicians C: music D: musician 18 Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. He said he wouldn"t have enough time to finish the job the following day. A: He said: "I won’t have enough time to finish the job tomorrow". B: He said: "I won’t have enough time to finish the job the following day”. C: He said: "I won’t have enough time to finish the job the following day". D: He said: "I won’t has enough time to finish the job tomorrow”. 19 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “Mom, I’ve got the first rank in class this semester!” - “ ________.” A: Well done! B: Thank you! C: Let’s go! D: Never mind!

Rewrite the sentences, using the words given. 1. This wet weather is so depressing. MAKES ........................................................................................... 2. I was very disappointed not to get the job. DISAPPOINTING ........................................................................................... 3. Her behaviour annoyed her teachers. FOUND ........................................................................................... 4. I thought the ending of the film is quite shocking. AT ........................................................................................... 5. I feel very relaxed when I see a romantic comedy. SEEING ...........................................................................................

nếu bài nào cần vẽ sơ đồ thì vẽ hộ mình nhé