Phân tích đa thức thành nhân tử:

Cho 23,8 gam X ( Cu, Fe, Al) tác dụng vừa hết 14,56 lít Clo (đktc) thu được hỗn hợp muối Y. Mặt khác, cứ 0,25 mol hỗn hợp X tác dụng với dung dịch HCl dư thu được 0,2 mol H2 (đktc). Tính % khối lượng mỗi kim loại trong hỗn hợp?

Cho tam giác ABC có A=90 , tia phân giác của BAC cắt BC tại D, vẽ đường thẳng qua D vuông góc AB tại E. Tam giác AED là tam giác gì? Vì sao?

Hộ mình vs ạ Mình cảm ơn 😂 Mình k đủ điểm nên mình ấy vào toán nhá Soryy m.n

Bài 3. Ấn tượng bao trùm về cảnh song nước Cà Mau được nhìn và cảm nhận dưới con mắt của “chúng tôi” là gì? Tìm những chi tiết trong văn bản thể hiện những ấn tượng đó?

Question 51: I my old school teacher last week. A. visited B. visit C. am visiting D. have visited Question 52. If you knew he was ill, why ______ you ________ to see him? A. didn't / come B. wouldn't / come C. should / come D. would / come Question 53. They _______ tired now because they ________ in the garden since 8 o'clock. A. are / worked B. were / were working C. are / have been working D. were / worked Question 54. Women no longer have to do hard work nowadays as they used to, _______. A. are they B. aren't they C. do they D. don't they Question 55. You _______ Tom yesterday. He's been away on business for a week now. A. mustn't have seen B. could not have seen C. may have not seen D. can't have seen Question 56: She agreed that all the present paperwork _____ for everyone to have more time to socialize. A. stopping B. be stopped C. to stop D. stopped Question 57: The speaker fails to get his message _______to his audience. A. around B. in C. across D. out Question 58: Air pollution is getting _______ serious in big cities in the world. A. more and more B. the more and the more C. the most and the most D. most and most Question 59: The authorities _______ actions to stop illegal purchase of wild animals and their associated products effectively. However, they didn't do so. A. needed have taken B. should have taken C. had to take D. must have taken Question 60: The scientists _______ on this project try to find the solutions to air pollution. A. working B. worked C. are working D. who working Question 61: if some endangered species ______ in zoos, it would help to ensure their future survival. A. will be kept B. are kept C. had been kept D. were kept Question 62: Susan rarely stays up late,______? A. is she B. isn't she C. does she D. doesn't she Question 63: It is vital that everyone ______ aware of the protection of the environment. A. is B. be C. are D. were Question 64: This is the second time you ______ your door key. A. are losing B. lose C. lost D. have lost Question 65: Not until 1856 ____ across the Mississippi River. A. the first bridge was built B. was the first bridge built C. the first bridge built D. did the first bridge build

Một người đi xe máy trên đoạn đường ABC.Biết trên đoạn đường AB người đó đi với vận tốc 16km/h, trong thời gian t1 = 15 phút; trên đoạn đường BC người đó đi với vận tốc 24km/h, trong thời gian t2 = 25 phút.tính vận tốc trung bình của người đó trên đoạn đường ABC.

Giúp mình 4 câu này nhé. Cảm ơn nhiều

Exercise 2: Fill in the suitable prepositions 1.Thanks ……….. your letter. 2.I’ll see my mom and dad …………….. their farm. 3.We have to work hard ……….home and…………….school 4.We’ll visit her ……….Christmas. 5.Are you tired …………..watching TV? 6.She often brings them …………… school. 7.He works ……….a factory. 8.We always go to Ha Long Bay ……….vacation. 9.Tell me more ………..your family. 10.Can you send me a photo ………..your family? 11.He goes ……….the city …………his wife. 12.It takes 18 hours to get ………Hanoi ……….coach. 13.We write ……….each other twice a week. 14.He is the president ………………….our club. 15.She spends most ………the time ………the couch ……front …….the TV. 16.What do you usually do ………….school? 17.Why don’t you come …………..? 18.They swap cards ……….their friends. 19.Will you play a game ……………..catch? 20.What do you do …………….. recess? 21.They usually have portable CD player …………….small earphones. 22.I’ll take part…………….your club. 23.They read or study ………….the same time. 24.We enjoy all ………………… our classes. 25.………….school we study many things. 26.…… history, we study past and present events…Vietnam and …the world. 27.…………..physics, we learn …………how things work. 28.She learns how to use a computer ………..her Computer Science class. 29.Newspapers are ……….the racks …………….the middle. 30.Math books are ……………..the shelves ………..the left. 31.The largest library is ………Washington D.C, the capital ……….the USA. 32.Those books ……….the back …………the libraries are ………English. 33.Now, come and look ……………the kitchen. 34.My uncle is …………..work now. 35.Can I see the rest ………the house? 36.She’ll have a party ………..her birthday.

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