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2 năm trước
Cho hai số nguyên x,y thỏa mãn x-2y chia hết cho 3 CMR:x^3+y^3 chia hết cho 9
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Các câu hỏi liên quan

1. She started working as a secretary 5 years ago. (for) 2. They intend to go on a picnic on Sunday. (intend to = be going to) 3. We began to stay and work from home 6 months ago because of the Covid-19 pandemic. (for) 4. I often went boating when I was young. (often +V2 = used to + V1) 5. He last met his girlfriend last summer vacation. (since) 6. Tom has played the piano since he was just a 5-year-old boy. (sicne  when) 7. How long have you studied medicine? (When) 8. It’s a long time since we became close friends. (for a long time) 9. The last time we saw him was in 2018. (since) 10. She said: “I’m living in Hai Duong now”.  She said she was living in Hai Duong then 11. The last time we met each other was 10 years ago. (for) 12. I cleaned the floor then I went to bed (after) 13. Despite his age, Mr Thanh runs 5km every morning. (Although) 14. Even though Phong was a rural-area student, he received a scholarship from a university in USA. 15. It’s 5 a.m. now, I am watering the flowers and my sister is baking some cookies. (while) 16. We are going to the museum after we finish this meal. (before) 17. Peter spent 3 hours repairing his computer. (took) *spend + time + V-ing = It takes somebody + time + to V1.  It took Peter 3 hours to repair his computer. 18. My boss has spent all her life pursuing her dream. (pursue: V1) 19. I haven’t read such a interesting novel before. (This is the first time)

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