viet thuong duoi dang so thap phan 2chia 7 bang

Hãy nhận biết 3 lọ đựng 3 chất răn sau Na2CO3,BAcl2,ZnSO4.bằng phương pháp hóa học Ai xong mà hay 5 sao nhé :))

Giúp mình với ạ. ___________________________________ Section 2. Choose the best answer to complete the following sentences. 1. In 1939, this was made to tell stories about the real life of Abraham Lincoln as a young man. A. biopic B. science fiction film C. action film D. horror film 2. Would you like to Lan’s house? A. going B. to go C. go D. to going 3. After school, children queue up and wait for the bus____on the pavement in front of the school. A. safe B. bumpy C. safety D. safely 4. When watching that , we can't help laughing at the stupid things of the main actor. A. documentary B. comedy C. action film D. horror film 5. In physics class the students do some . A. example B. exercises C. experiments D. entertainment 6. Do you know the in the UK is to keep to the left? A. traffic light B. traffic rule C. traffic jam D. speed limit 7. The boys are playing after school. A. skipping B. marbles C. soccer D. maths 8. Astronauts _ in their spaceship, but they frequently work outside now. A. were used to stay B. used to stay C. had used to stay D. were staying 9. Ba often stamp. Maybe he is a stamp collector. A. collects B. sells C. buys D. draws 10. My son feels very happy when he sees that with a lot of cute animals. A. horror film B. biopic C. thriller film D. animation 11. You must the traffic rules in order to avoid accidents. A. park B. obey C. reverse D. warn 12. In the USA students school uniform A. wear B. wearing C. don't wear D. not wear 13. You can borrow books from the A. Bookshop B. library C. canteen D. shoes store 14. People that the earth is round before. A. were not used to believe B. used to believing C. would not use to believe D. did not use to believe 15. There used to be fewer people and on the roads. A. roofs B. helmets C. helicopters D. vehicles 16. Tuan learns to repair household appliances in class A. Physics B. electronics C. Biology D. History 17. It is dangerous to ride a motorbike without a . A. helmet B. triangle C. tricycle D. circle 18. Most say that this film is worth watching. A. plots B. settings C. critics D. acting 19. In Hanoi, during rush hour, some road users ride their motorbikes on the . A. driving licence B. lane C. pavement D. seat belt 20. Tuberculosis incurable before. A. use to be thought B. used to be thought C. used to think D. use to think 21. We learn about different countries and their people in class. A. Literature B. Geography C. History D. Sciences 22. Traffic is terrible during the___when everyone is in a hurry to get to work or come back home. A. traffic light B. road sign C. traffic rule D. rush hour 23. The for motorcycles is 40 km/h in towns and 60 km/h outside urban areas. A. speed limit B. driving licence C. traffic rule D. traffic light 24. Formerly babies of whooping cough. A. have died B. used to die C. would die D. both B and C 25. It takes us more than three hours to drive across those roads. A. wide B. safely C. right-handed D. bumpy 26. You need a driving licence to . A. drive a car B. get off the train C. get on the bus D. ride a bike 27. The large supermarkets in Vietnam often let you free. A. park B. obey C. warn D. find 28. Newton scientific books when being a boy. A. used to read B. has read C. had been reading D. had read 29. Some vehicles beep when they to warn those behind. A. ride B. reverse C. drive D. sail 30. He acts very well. I'm sure that yesterday he stayed up all night reading the . A. acting B. character C. survey D. script 31. Before you go to the cinema, you can watch the trailer and read of the film. A. reviews B. disaster C. critic D. character 32. do you watch T.V. - I sometimes watch T.V A. When B. How often C. what time D. How far 33. These city girls are used in the field. A. to work B. used to lie C. would like D. to working 34. Mai enjoys tennis. A. to play B. playing C. play D. to playing 35. That was a and boring horror film so I slept from the beginning to the end. A. shocking B. entertaining C. gripping D. predictable 36. I didn't expect the movie to be so interesting and so ! I cried at the end of the film. A. moving B. violent C. confusing D. hilarious 37. Students usually have a each year. A. 3-months vacation B. 3-month vacations C. 3- month vacation D. 3- months vacations ________________ Thank you <3

Giúp e câu 4 với ạ, cảm ơn mọi người nh

Tìm số nguyên x,biết: (x mũ 3+8).(-2x-5)=0

Chứng minh đẳng thức ( đề bài) a.(a-b+c)-(a+c)=-b b.(a+b)-(b-a)+c=2a+c c.-(a+b-c)+(a-b-c)=-2b d.-a(b-c)-b.(c-a)=-c(b-a) Làm ơn hãy giúp mik nha😀

Từ độ cao 125 m người ta thả một vật rơi thẳng đứng xuống đất. Lấy g = 10 m/s2. a/ Sau bao lâu vật chạm đất? b/ Tính vận tốc của vật lúc vừa chạm đất.

cho tam giác ABC vuông tại A , đường phân giác góc B cắt AC tại D . Vẽ DH vuông góc BC (H thuộc BC ) chứng minh : tam giác ABD = tam giác HBD trên tia đối của AB lấy điểm K sao cho AK = HC chứng minh ba điểm K,D,H thẳng hàng

Nguyên tử, phân tử là gì ? Nguyên tử khối, phân tử khối là gì ? Cho ví dụ ?

tìm m để pt có nghiệm kép: mx2 - 2(m-1) + 2=0