lamf giups mik nha!! mik sex vote 5 * và cám ơn, ctrlhn Bài 1. Chứng minh rằng: S=3+3^2+3^3+3^4+3^5+3^6+3^7+3^8+3^9 chia hết cho (-39) Bài 2. Cho số (gồm 20 chữ số 1). Hỏi số a có chia hết cho 111 không? Bài 3. Cho a, b là các số nguyên. Chứng minh rằng 5a + 2b chia hết cho 17 khi và chỉ khi 9a + 7b chia hết cho 17.

Bore excite interest tire interest bore 1. I wish this book weren’t so ........... I keep falling asleep whenever I try to read it. 2. Do you think football is - ............................? Oh, I don’t think so. I find table tennis is a most suitable sport for mysefl.” 3. I’m ..................... right now. Last night I had a terrible nightmare? 4.The film was ................................... Nothing happened. 5. Thomas was very ................... about his new bicycle as a birthday present. He had woken up at 5 a.m and role the bicycle around the street. 6. This is a very ............... book about the history of the cinema. I’m learning a lot.

Giúp mình giải bài này vs mình bị mất căn bản

giai bai nay giup minh minh cam on

I. Read the passage below and decide whether the statements are TRUE or FALSE? Television has become an important part of people's life. It’s a wonderful source of information and entertainment. It’s also a great tool for learning and communication. People have enjoyed spending their time watching TV every day. There are both national and local channels on TV. Adults enjoy watching news, talk shows, and series. Children likes watching cartoons, comedies and some educational programs. It’s relaxing to watch television after a long day of hard work. 1. Television is a source of information and entertainment. 2. We cannot use TV for learning. 3. People watch TV every day. 4. Adults enjoy watching cartoons, comedies and some educational programs. 5. It’s relaxing to watch television after a long day of hard work. II. Choose the letter A, B, C or D to complete the passage below Television is one of _________ (6) inventions of human beings. Today we can find television almost everywhere ___________ (7) the world. The first television was invented in 1927 by a 21 years old inventor – Philo Taylor Farnsworth. Watching television __________ (8) both recreational and informative. There are some news programs for adults _________ (9) information. There are also tutorial channels based on specific subjects for the students. ___________ (10), it’s harmful to spend too much time watching television. Some shows are too violent for the children to watch because they may imitate. 6. A. greater B. the greatest C. great D. greater than 7. A. of B. on C. in D. at 8. A. is B. are C. be D. am 9. A. to get B. getting C. get D. to be getting 10. A. Because B. Therefore C. But D. However III. Choose the letter A, B, C or D to answer these following questions Hi, my name is David and my favorite activity is watching television. I often watch cartoon on Disney channel. My grandmother and mother enjoy watching craft programs. My daddy and brother love watching football matches on the sport channel. I usually spend about 2 hours a day watching TV. In the evening, all the family gather and watch the news and weather forecast. Today, the weatherman announces that it will rain tomorrow. I think you should bring along a raincoat before going out. 11: What is David’s hobby? A. dancing tango B. playing football C. watching television D. doing homework 12: What does he often watch on Disney channel? A. news B. cartoon C. craft D. sports 13: Who love watching football matches? A. His brother B. His father C. His mother D. Both A&B 14: How many hours a day does David spend watching TV? A. one B. two C. three D. four 15: Will it rain tomorrow? A. Yes, it will B. Yes, it is C. No, it won’t D. No, it isn’t

who is.................. student in your class (tall)

trong quá trình nuôi cấy không liên tục của VSV nên thu hoạch vào pha nào là tốt nhất. Vì sao?

Cho 3,6 (g) kim loại Magie tác dụng hoàn toàn với dung dịch axit Sunfuric thu được V (l) khí (đktc). 1) Viết phương trình hóa học xảy ra. PTHH : 4Mg + 5H2SO4 --> 4H2O + H2S + 4MgSO4 (4 : 5 : 4 : 1 : 4) 2) Tính V? 3) Dẫn toàn bộ lượng khí trên qua sắt (III) oxit nung nóng thu được m (g) kim loại. Tính m?

Một ôtô đi từ A đến B với vận tốc 45km/h rồi từ B quay trở về A với vận tốc nhanh hơn lúc đi là 5km/h nên thời gian về nhanh hơn thời gian đi là 20 phút. Tính quãng đường AB?

Hiện tượng khi cho Zn vào HCL? Có phản ứng xảy ra không? Nếu có viết phương trình phản ứng? Đưa tàn que đóm đỏ vào có hiện tượng gì? Đưa que đóm đang cháy vào ống dẫn khí , nếu có hiện tượng nêu hiện tượng?