Bài 1: Tính khối lượng kết tủa và khối lượng các chất trong dung dịch khi cho dung dịch chứa 17,1 gam Ba(OH)2 tác dụng với 4,48 lít SO2 (đktc). Bài 2: Tính khối lượng kết tủa và khối lượng các chất trong dung dịch khi cho dung dịch chứa 42,75 gam Ba(OH)2 tác dụng với 6,72 lít SO2 (đktc)

Tính: a.(x+3y)(x ² - 2xy+y) b.(6x+1) ²+(6x-1) ²-2(36x ²-1) c.(2x^5-5x ³+x ²+3x-1):(x ²-1) d.(x ²-81+y ²-2xy):(x-y-9)

1. If I were you, I ..................... do something to prevent him from littering.) * A. would B. did C. will D. do 2. Many aquatic animals and plants.............. due to the oil spill. * A. dies B. having died C. have died D. to have died 3. “Do you need an umbrella to go out?” Hoa’s mother asked. * A. Hoa’s mother asked if you need an umbrella to go out. B. Hoa’s mother asked if you need an umbrella to go out. C. Hoa’s mother asked if you needed an umbrella to go out. D. Hoa’s mother asked if she needed an umbrella to go out. 4. You will do the test well. You will review them all hard. * A. If you reviewed them all hard, you will do the test well. B. If you review them all hard, you will not do the test well. C. If you review them all hard, you will do the test well. D. If you will review them all hard, you will do the test well. 5. He drives the most ………………..in the race. * A. quick B. quickly C. quicker D. more quicker 6. The librarian asked us ...................so much noise. * A. don't make B. not make C. not to make D. not making 7. Laura enjoys ................... on the phone with her friends. * A. chat B. chats C. chatting D. chatted 8. The roof of the house .......................... in a storm last week. * A. was damaged B. damaged C. has damaged D. has been damaged 9. This time next week we...................around Africa. * A. are travelling B. travel C. will travel D. will be travelling 10. Did the boys give food to homeless people yesterday? * A. Was did the boys give food to homeless people yesterday? B. Was food given to homeless people yesterday? C. Was food give to homeless people yesterday? D. Were food given to homeless people yesterday? 11. If I were you, I..................this work. * A. do would B. did not C. wouldn’t do D. won’t do 12. Earth .................. by the gravity of the Sun and orbits around it. * A. holds B. is holding C. held D. is held 13. Would you mind..............me a hand? * A. giving B. give C.to give D. have given 14. We don’t have a map, so we get lost. * A. If we have a map, we wouldn't get lost. B. If we don’t have a map, we will get lost. C. If we had a map, we wouldn't get lost. D. If we had a map, we won't get lost. 15.By the time we ........................ to the cinema, the film had started. * A. gets B. had got C. has got D. got 16. Thu said that" I often play chess with my friends”. * A. Thu said that she often play chesswith her friends. B. Thu said that I often played chess with her friends. C. Thu said that I often play chess with her friends. D. Thu said that she often played chess with her friends. 17. Dick drives the ……………. in the race. * A. slow B. slowly C. more slowly D. most slowly 18. The trees can ………….. well because there is land pollution here. * A. grow B. not grow C. growing D. not grown 19. Which TV programme.........at 9 p.m tommorrow? * A.do you watch B. will you be watching C. did you watch D.will you watch 20. The farmer rides the buffalo-..................... carts loaded full of rice home. * A. draw B. drawing C. drew D. drawn

Viết các phương trình hóa học, cân bằng, điều kiện phản ứng nếu có để hoàn thành dãy chuyển hóa sau: SO2-> SO3-> H2SO4-> CuSO4-> Cu(OH)2-> Cuo

............................................................................................... cho tam giác ABC có A = 60*, B = 80* và có phân giác AD . 1) ADB =? 2) So sánh các cạnh của tam giác ADB 3) So sánh các cạnh của tam giác ADC

Câu đố hại não số 1 Có một cây gỗ dài 8m. Một bác thợ mộc muốn cưa cây gỗ đó thành những khúc gỗ dài 16dm. Biết rằng, mỗi lần cưa hết 5 phút, cưa được một khúc gỗ thì bác ấy nghỉ ngơi thêm 3 phút nữa. Hỏi bác thợ mộc cưa xong cây gỗ hết thời gian bao nhiêu phút?

Viết bài văn ngắn trình bày suy nghĩ về sự tử tế (Lập dàn ý)

giúpppp 11. If we (not act) ______________ soon, we (lose) ______________ that forest in five years. 12 .If I (can) _____________ choose a city to visit, I (go) ______________ to San Francisco. It’s my dream. 13. She (pass) _____________________________ the examination if she had studied hard 14. If there (be) __________ no water and air, there (be) ____________ no life on Earth.

Mn giúp e 2 câu này với giúp e câu 7 với câu 8 nha 🥰🥰🥰🥰🥰🥰

Ai giải giúp mik vs ạ mik cần gấp