a,Trộn 24ml H với 15ml O2 trong bình đốt khí rồi cho hỗn hợp nổ. Sau khi nổ chất nào còn thừa? Bao nhiêu ml? b, Để nguội bình rồi mở nắp. Khối lượng các chất trong bình có thay đổ ko và thay đổi như thế nào?

Xét tính tuần hoàn và tìm chu kì (nếu có ) của hàm số sau $a,y=\frac{cos √ 2x}{sinx}$ $b,y=\frac{1}{2}tan(x-\frac{\pi}{3})+cot(\frac{x}{2}-\pi)$ $c,y=sin^{2}(2x)-cos(2x+\pi)$

do/ stay /try/take/go{x2}/collet/eat/watch/plant . we enjoy ...... for a walk around the lake every evening

Mn giúp mk với ạ Em cảm ơn trước

Vẽ đậu tuk NL: Mod cứ xóa câu trl cụa tui rồi còn cho cảnh báo nữa, mong là ad hủy làm mod luôn cho nhẹ T^T

chỉ cần ghi đáp án ạ ko cần giải thích làm j dài dòng (chỉ đáp án thôi cũng dài rồi) khó thiệc sự Question 1: Supply the correct forms of the verbs in brackets.(10points) 1. She felt that she (look) at. 2. I can't go out because I (not finish) my homework. 3. If you kicked the policeman, you (arrest) 4. All students objected to (do) that work. 5. Trang isn't in her room at the moment. She (cook) in the kitchen. 6. I can't afford ( go) on holiday abroad this year. 7. Passengers (travel) on this bus bought their tickets in books. 8. I (not use) the car this evening, so you can have it. 9. The man who (rescue) had been in the sea for ten hours. 10. People always (blame) their circumstances for what they are. Question 2: Use the correct form of the words in brackets to complete sentences 1. The child should be punished because of his bad ........... ( behave) 2. The ...........in this town are very friendly (reside) 3. Every week, there are two ...........from Ha Noi to Nha Trang. (fly) 4. We're very impressed by the ..........of your town's people. (friend) 5. All the newspapers praised the ..........of the firemen (brave) 6. It was ............not to write down the address. ( fool) 7. The tiger wanted to see the farmer's ............. (wise) 8. Bell experimented with ways of transmiting ....over a long distance. (speak) 9.Freedom of ...........is one of the fundamental rights. (speak) 10.The duty of the police is the .............of law and order. (maintain) Question 3: b) Fill in the blanks with a suitable preposition. 1. Measuring money must be very difficult to carry........... 2. In this respect, French differs .............English 3. I'll come............to pick her up at 8 o'clock. 4. The passage is written ..............English . 5. Mr Duc Thanh is thinking of exporting rice ............India. Question 4: Fill in each numbered blank with a suitable word If you live in a city, you probably see many people, hear the (1)............of traffic, and smell the pollution (2).........cars and factories. We are entering a new time in (3) ......history of the world. Before this, most (4) ..... ..... were farmers. They lived in the country. Now many people are (5) .....the farms and moving into the cities. They are looking for better jobs. The cities are growing very quickly. Most cities are very crowded. People are driving more cars, burning more fuel, (6).......more water, eating more food, making more garbage, and producing more things in factories than (7)..........before. Life is becoming difficult. Some governments are trying to plan for the future. They are building new roads, putting (8) .........new houses, looking for more water, and limiting growth in certain areas. Still, city planners are getting worried. People are crowding into the cities (9) ....... than cities can take them. The cities are running out (10).........room. What is the answer to this problem?

Tìm 1 số tự nhiên sao cho chia 3 dư 1, chia 4 dư 2, chia 5 dư 3, chia 6 dư 4 và chia hết cho 13. a, Tìm số nhỏ nhất có tính chất trên b, Tìm dạng chung của tất cả các số có tính chất trên

Dẫn 1,12 lít khí lưu huỳnh đioxit (đktc) đi qua 700 ml dung dịch Ca(OH)2 0,1M. a) Viết phương trình hoá học. b) Tính khối lượng các chất sau phản ứng.

nêu cấu trúc , sử dụng , dấu hiệu nhận biết ( quá khứ đơn, quá khứ tiếp diễn, quá khứ hoàn thành) chi tiết lên nhé

Giúp e với : Tách hỗn hợp gồm mùn cưa, muối và cát ? Mong m.n giúp e và trình bày đầy đủ ạ E cảm ơn