1.có mấy cặp số a,b là số tự nhiên sao cho 2^a+37=|b-45|+b-45 a.4 b.1 c.2 d.3

1. She doesn’t live in London because she doesn’t know anyone there  She’d will lived in london if she known anyone in there 2. I can’t live in the country because I can’t find a job there  I’d will 3. I don’t have a spare ticket. I can’t take you to the concert  If I ………………………………………………………………... 5. They don’t understand the problem. They won’t find a solution  If they didn’t undertand the problem they wont find the solution 6. He sits around too much. He isn’t fit.  If he not sat ảound too much he wont fit 7. She’s very thin; perhaps that’s why she feels cold so much.  If she wasn’t thin she will feels cold so much 8. He never polishes his shoes, so he never looks smart  If he polished his shoes he will looks smart 9. He can’t park near his office; that’s why he doesn’t come by car  If he wasn’t come by car he couldn’t park near his office 10. My house is guarded by two big dogs. That’s the only reason it isn’t broken into every night  If my house 11. The flats are not clearly numbered, so it is very difficult to find anyone.  If the flats …..……………………………………………………….. 12. I don’t know her e-mail address, so I can’t tell you  If I ……………………………………………………………………. 13. She works in the evening. She has no time to play with her children  If she …………………………………………………………………. 14. I am not tall enough to join the basketball team  If I …………………………………………………………………… 15. He doesn’t see the signal so he doesn’t stop his car  If he …………………………………………………………………. 16. Peter gets bad marks because he doesn’t prepare his lessons well  If Peter ……………………………………………………………… 17. Mary doesn’t have enough money. She can’t buy a new car.  If Mary ……………………………………………………………… 18. Go right now or you’ll be late for the train.  If you…………………………………………………………………. 19. Hurry up, or we will be late for the exam.  If we …………………………………………………………………

Lập phương trình hoá học của phản ứng

Anh chị giúp em với ạ em đang cần gấp

Cho (d1) : y = 2x – 1 và (d2) : y = x – 2 . a) Vẽ đồ thị (d1) và (d2) trên cùng một mặt phẳng tọa độ. b) Xác định tọa độ giao điểm A của (d1) và (d2) bằng phép tính. c) Tính góc tạo bởi (d1) và (d2) với trục Ox. (làm tròn đến phút) d) Viết phương trình đường thẳng (d3) biết (d3) cắt trục hoành tại điểm có hoành độ bằng 4/3 và (d1), (d2), (d3) đồng quy.

tìm tỉ số lượng giác gọc A biết tg A=1/3

VI. Fill in each numbered space with ONE appropriate word.(10 pts) Today in China (1) ...large scale destruction of forests has occurred, the government has required that every citizen (2)......the age of 11 and 60 plant three to five trees (3) ......year or do the equivalent amount of work in other forest services. The government claims that at ( 4) ......1000 million trees have been planted in China every year (5)...........1982. In Western countries, increasing consumer demand for wood products that (6)...... been produced cause forest land-owners and forest industries (7)...... become increasingly accountable for their forest management and timber harvesting practices.The Arbor Day Foundation’s Rain Forest Rescue programme is a charity that helps to (8) ......deforestation. The charity uses money to buy up (9) ......preserve rainforest land before the lumber companies can buy it. The Arbor Day Foundation then (10)....... the land from deforestation.

cho hình vẽ, biết SI là tia tới. Hãy vẽ một vị trí đặt gương sao cho tia phản xạ có phương nằm ngang chiều từ trái sang phải

Hai kho chứa 3 tấn 105 kg thóc . Tìm số thóc của mỗi kho, biết rằng số thóc của kho thứ nhất bằng số thóc của kho thứ hai

phân tích đa thức thành nhân tử : a^4b+a^2b^3+ 9b^5