Tìm số tự nhiên a sao cho 6a-13/5a-17 max

$\frac{5x+2}{3xy^{2}}$:$\frac{x+4}{xy^{2}}$

Giúp mình với ạ, mình cảm ơn nhiều

Exercise 9: Give the correct form of the verb in brackets. 1. If we send an invitation, our friends (come) will come to our party. 2. He doesn’t understand you if you (whisper) whisper. 3. She will forget to pick you up if you (not phone) don’t phone her. 4. If you press “CTRL + S”, you (save) will save the file. 5. I will remember you if you (give) give me a photo. 6. Fred will answer the phone if his wife (have) has a bath. 7. If Claire wears this dress at the party, her friends (be) will be happy. 8. If I touch this snake, my girlfriend (not scream) will not scream. 9. If he (study) studies harder, he can pass an exam. 10. She may be late if she (not hurry) doesn’t hurry. 11. Tell him to ring me if you (see) see him. 12. If you are kind to me, I (be) will be good to you. 13. If he (give) gives up smoking, as his doctor orders, he will be soon well again. 14. You (not pass) will not pass your driving test unless you drive more carefully. 15. He’ll be ill if he (not stop) doesn’t stop worrying so much. 16. Jane never (get) can get there on time if the train leaves soon. 17. I’ll be very angry if he (make) makes any more mistakes. 18. If he (wash) washes my car I’ll give him $10. 19. If he (not eat) doesn’t eat all, he will be ill. 20. If you don’t finish (not finish) your homework, you can’t play computer games.

Cm n mũ 6 -1 chia hết 7 với n thuộc N và không chia hết 7

Thu gọn biểu thức: (a - b) + (b - c + a) + (c - b). Giúp mình với, mình đang cần gấp! Thanks mọi người!

Exercise 8: In each space put few - a few - little - a little to complete the sentences. 1. If you have ………………… time, could you come and have a look at my computer? It’s not working very well. 2. She is quite poor. Ever since she lost her job last year, she’s had ………………… money. 3. I don’t want any more wine, thank you. I have ………………… here. 4. Jack has ………………… friends and is often at home alone. I worry about him, you know. 5. You know ………………… people here, don’t you? I’ll leave you to chat. 6. That new employee is great. She asked me a few questions at the start and, since then, seems to need ………………… help. A very independent type! 7. I have ………………… patience for your stupid questions Smithers. Now tell me what you want and stop wasting my time. 8. Add ………………… salt to the soup. It needs it! 9. “How many extra chairs do you need for the dinner tonight?” “………………… We have almost all the chairs we need.” 10. This hotel is ………………… better than the one where we were last year! I don’t know why we changed! 11. The postman doesn’t often come here. We receive ………………… letters. 12. The snow was getting quite deep. I had ………………… hope of getting home that night. 13. A: I’m having ………………… trouble fixing this shelf. B: Oh, dear. Can I help you? 14. I shall be away for ………………… days from tomorrow. 15. Tony is a keen golfer, but unfortunately he has ………………… ability. 16. I could speak ………………… words of Swedish, but I wasn’t very fluent. 17. Could I have ………………… cream, please? 18. Very ………………… people were flying because of terrorist activities. 19. Can you speak English? – Just ………………… 20. He gave ………………… thought to his future.

Exercise 7: Put in “a few” or “a little” to complete these sentences. 1. There are ………………… bottles on the table. 2. There are ………………… hotels in this town. 3. I want to eat ………………… bread. 4. Have you got ………………… magazines at home? 5. Put ………………… cooking oil in the pan. 6. Sindy has only ………………… flowers. 7. There are quite ………………… buffaloes in the field. 8. There is only ………………… food in the refrigerator. 9. He has………………… cats. 10. Every day she drinks ………………… green tea. 11. We need ………………… help. 12. I give ………………… fish to my cat. 13. We learn ………………… every day. 14. Jane needs ………………… books. 15. He has ………………… good ideas.

Câu 3: Một cửa hàng bán gạo, ngày thứ nhất bán được 960 kg gạo, ngày thứ hai bán được 95% số gạo bán ngày thứ nhất. Tổng số gạo bán trong 2 ngày bằng 20% số gạo lức đầu của cửa hàng. Hỏi lúc đầu cửa hàng có bao nhiêu tấn gạo? Câu 4: Người ta dự định chia 6,25 kg bánh vào các hộp,mỗi hộp chứa 0,25 kg bánh.Đồng thời dự định chia 5,5 kg kẹo vào các hộp, mỗi hộp chứa 0,25kg kẹo. Hỏi có tất cả bao nhiêu hộp bánh và kẹo Câu 5: (1 điểm) Tính bằng cách thuận tiện nhất: 13,25 : 0,5 + 13,25 : 0,25 + 13,25: 0,125

cho đường thẳng b và các đoạn thẳng AB, BC sao cho đoạn thẳng Ab không cắt b , đoạn thẳng BC cắt b. Bằng lập luận , hãy chứng tỏ đoạn thẳng AC cắt đường thẳng b