Trong một cuộc thi tài Toán Tuổi thơ có 51 bạn tham dự. Luật cho điểm như sau: + Mỗi bài làm đúng được 4 điểm. + Mỗi bài làm sai hoặc không làm sẽ bị trừ 1 điểm. Bạn chứng tỏ rằng tìm được 11 bạn có số điểm bằng nhau.

Đặt câu hỏi dưới từ gạch chân:yes, it is my aunt Từ gạch chân: yes

Chứng tỏ 2 phương trình sau là tương đương

điều chế khí O2 = cách nhiệt phân 24,5 g Kaliclorat (KCLO3) a)Viết PTPU b)tính khối lượng KCL sinh ra c)tính thể tích khí O2 ở đktc d)nếu cần điều chế 33,6 lít khí O2 thì cần dùng bn gam KCLO3

II. Rewrite these sentences, using an if construction. 1. Bich is worried because Trung looks at her 2. Be quiet or I’ll kill you 3. Nga doesn’t feel happy ,so she eats sweats. 4. If it doesn’t rain tonight, Thanh will go to bed early.(unless) 5. Hien doesn’t walk quickly because Hien is hungry. 6. Hurry up or I’ll go alone 7. Ngan cries so much because she is lonely. 8. If it isn’t nice, we’ll drink coffee.(unless) 9. My doesn’t have much money, so My can’t lend Nhan 10. Jack isn’t a fish so he can’t be a shark. 11. Chi doesn’t like Hai because he has white hair. 12. Be happy or you’ll die 13. Anh is absent from class regularly because Anh plays games 14. If Cuc and Vu don’t drink milk ,they won’t grow well. (unless) 15. Without love, people would die. (If there weren’t …) 16. People couldn’t live without money . (If there weren’t …) 16. An isn’t tall, so Vu doesn’t look at her. 17. People don’t talk to Jack because he is a dangerous man. 18. Everyone wouldn’t exist without the sunlight . (If there weren’t …) 19. Noi becomes happy because he has a gift from Ngan. 20. Unless Ha comes early, Hai will be angry. 21. Alex likes cats so she buys ten cats. 22. John is not a superman, so Sue can be an angel. 23. Unless it rains, Ann will ride her horse to school. 24. An doesn’t have wings , so she can’t fly to school. 25. Chi isn’t an ocean because Vu isn’t a boat. 26. Without plant, the earth wouldn’t exist. 27. I didn’t know you were coming to Ha Noi .That’s why I went on holiday. 28. The thief left his gloves at the scene. He was arrested. 29. She walked to the meeting so she was late . 30. Now, She is working at the factory, so she can’t meet you. 31. The woman didn’t say what she wanted, so I put the phone down. 32. Hurry up or we’ll go first. 33. I am not you, so I can’t help him. 34. He don’t speak clearly, so we can’t understand him. 35. You didn’t ask me, I didn’t explain it to you. 36. Laura doesn’t come .She can’t help us. 37. Remember to turn on the lights or you will be in the dark. 38. He didn’t have time, so he didn’t go with us. 39. I have to study .I can’t go to the movie with you. 40. They don’t lend me the money, so I don’t go in to business right way. 41. We didn’t have their phone

. Viết phương trình đường thẳng đi qua hai điểm: a) A(1;3) và B(3;2). b

vẽ đậu mầm đi ngoài lề: mới tạo nick mơi mà lười cày quá :)

viết chương trình nhập 2 số nguyên M,N /m khác n/ hãy viết ra màn hình các số chẵn và tính tổng các số đó từ M đến N

20₫ giúp em 2 câu này với ạ Em cần gấp

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