-20/41×-4/5 làm nhanh giúp em ạ

Chỉ đùa là đang đi thi mà vị bc. 😂🤣

giúp mình với ạ :) Mình cám ơn Mình cần gấp mong các cao nhân giúp đỡ

Giúp mình với pls, cảm ơn mọi người nhiều

giúp mình vsssssssssssssssssssss

Hỗn hợp A gồm BaO, FeO, Al2O3. Hoà tan A trong lượng dư nước, được dung dịch à và phần không tan B. Sục khí CO2 dư bào dung dịch D, phản ứng tạo kết tủa. Cho khí CO dư đi qua B nung nóng thu được chất rắn E. Cho E tác dụng với dung dịch NaOH dư, thấy tan một phần còn lại chất rắn G. Hoà tan hết G trong một lượng dư dung dịch H2SO4 loãng rồi cho dung dịch thu được tác dụng với dung dịch KMnO4. Xác định các chất . Viết các phương trình phản ứng xảy ra.

Exercise 1. Read the situations and write wishes you want to make for them. 1. Many schools are overcrowded because there are so many children in Viet Nam. -> I wish many schools weren’t overcrowded. 2. My school has no playground equipment or extra activities. -> I wish ……………………………………………………………………….. 3. In the Mekong Delta, small children go through some foot bridges in order to get to school. -> I wish …………………………………………………………………………. 4. Kindergarten teachers don’t have training courses in making handmade teaching materials. -> I wish …………………………………………………………………………….. 5. Children from poor families can’t go to school because they have to earn money to support their families. -> I wish …………………………………………………………………………… 6. The school authorities can’t set holidays based on local weather conditions. -> I wish …………………………………………………………………….. 7. That university often doesn’t attract enough enrolments for the new school year. -> I wish ……………………………………………………………………… 8. We can’t study the books written by famous scholars in the Ly and Tran dynasties because Chinese Ming aggressors took them to China. -> I wish …………………………………………………………………………… 9.Many small children don’t learn how to swim so they often suffer from drowning. -> I wish …………………………………………………………………………… 10.Many graduates from college don’t have enough skills to meet the requirements of their jobs. -> I wish ………………………………………………………………………….. Exercise 2. Rewrite each sentence, beginning as shown. 1. He can’t park near his office; that’s why he doesn’t come by car → If he ………………………………………………………………….. 2. The flats are not clearly numbered, so it is very difficult to find anyone. → If the flats …..……………………………………………………….. 3. I don’t know her e-mail address, so I can’t tell you → If I ……………………………………………………………………. 4. She works in the evening. She has no time to play with her children → If she …………………………………………………………………. 5. I don’t want them to be upset, so I’ve decided not to tell them what happened. → They …………………………………………………………….. 6. He doesn’t see the signal so he doesn’t stop his car → If he …………………………………………………………………. 7. Peter gets bad marks because he doesn’t prepare his lessons well → If Peter ……………………………………………………………… 8. Mary doesn’t have enough money. She can’t buy a new car. → If Mary ……………………………………………………………… 9. Go right now or you’ll be late for the train. → If you…………………………………………………………………. 10. He doesn’t apply for the job because he doesn’t have enough qualifications. → If he …………………………………………………………………. 11. Because you speak English unnaturally, they do not understand you. → If you …………………………………………………………………

1) Cho chất A tác dụng với chất B được khí I có mùi trứng thối. Đốt cháy khí I khi có mặt oxi dư được khí II có mùi hắc. Cho khí I tác dụng với khí II được chất C màu vàng. Nung chất C với sắt được chất D, cho D tác dụng với dung dịch HCl được khí I. Xác định các chất. Viết các pt phản ứng xảy ra. 2) Nhiệt phân hoàn toàn hỗn hợp gồm: BaCO3, MgCO3, Al2O3 được chất rắn A, khí D. Hoà tan A trong NaOH được dung dịch B và chất rắn C. Sục B vào D thấy có kết tủa. Hoà tan C trong dung dịch NaOH dư thấy kết tủa tan một phần. Xác định các chất. Viết các pthh.

ngồi trên một ô tô,khi xe tăng tốc,ta bị kéo ngã về phía sau.Còn khi xe phanh gấp,ta bị chúi về phía trước.Vậy có cách nào nhận biết 1 chiếc xe đang chuyển động thẳng đều?

Cần gấp During the 1990s, hollywood introduced special effect images created by computer, which (1)_______ more fantasy stories possible. Steven Spielberg made dinosaurs come to life in present-day settings in Jurassic Park. Men in Black was a popular science-fiction comedy about special agents (2)_______ hunt alien creatures from other worlds. Such films were sometimes criticized for (3) _______ special effect to replace story elements. Computer animation reached new (4)_______ in such films as Toy Story and Dinosaur. Computer special effect contributed to the (5)______ of Titanic, which broke box-office records throughout the world. The movie portrayed the famous 1912 collision between a luxury ocean liner and an iceberg. It told a romantic story while showing spectacular scenes of the (6)______ ship. In the early 2000s, several movies became huge international (7)______. They (8)______ Harry Porter and Sorcerer's Stone and Harry Porter and the Chamber of Secrets. 1.a did b. Made.c.let d.allow 2.a who. B when .c what. D whom 3. A . Allow. B. Allows .c allowing.d.to allowing 4. A high .b tall c. Tops d. Heights 5.a success b. Successful d . Succed d. Succesion 6.asink b. Sinking c. Sank d. Sunk 7. A titles b. Awards .c prizes d. Hits 8.a. contained b. Had c. Included d. Excluded

1) Đốt cacbon trong không khí ở nhiệt độ cao, được hỗn hợp khí A. Cho A tác dụng với Fe2O3 nung nóng được khí B và hỗn hợp rắn C. Cho B tác dụng với dung dịch Ca(OH)2 thu được kết Tủa K và dung dịch D, đun sôi D lại được kết tủa K. Cho C tan trong dung dịch HCl dư thu được khí và dung dịch E. Cho E tác dụng với dung dịch NaOh dư thu được hỗn hợp kết tủa hidroxit F. Nung F trong không khí được oxit duy nhất. Xác định các chất. Viết các phương trình phản ứng. Giải giúp em với nha

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