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khanhvu20072004
2 năm trước
CMR (5n+7).(4n+6)chia hết cho 2 với mọi số tự nhiên N (8n+1).(6n+5)không chia hết cho 2 với mọi số tự nhiên N Mọi người giải theo cách lớp 6 với ạ
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Các câu hỏi liên quan

1. In Sweden, most of the houses will be __________ by _________ energy soon. (hot / sun) 2. Snow in April is an unusual _________________ in this area. (occur) 3. Good _________________ were the key to success. (prepare) 4. People sang Auld Lang Syne ________________ on New Year’s Eve. (joy) 5. We love our grandma for her _________________. (generous) 6. Mary is ________________ to be the most famous girl in our school. (considerate) 7. We think that Mother’s Day should be celebrated __________________ (nation) 8. We are very busy ___________________ the Lunar New Year holiday. (celebration) 9. I worry about the _____________ effect that violent films may have on children. (destroy) 10. He’s been one of the most effective ____________ in the campaign. (act) 11. Her parents are _______________ that she had won the first prize. (joy) 12. The school was completely ________________ by fire. (destruction) 13. When there is a volcanic _______________, hundreds of people may lose their life. (erupt) 14. The ______________ resorts are empty in winter. (coast) 15. _______________, the typhoon caused severe damage to the village. (luck) 16. The talk ended ___________ when one of the delegations walked out in protest. (abruptness) 17. She is an _____________ teacher who graduated from the university last year. (experience) 18. ……………………… ! You passed the exam …………………… (congratulate / success) 19. ……………………., the storm didn’t damage much to the villages. (fortune) 20. If you are a good student, you must know how to study ……………………. (effective) 21. A stay in the country will be …………………. to his health. (benefit) 22. Acting has brought me enormous ……………………… (enjoy) 23. After the hit summer, there was a ………………….. of water. (short) 24. Air …………………… is a big problem in big cities. (pollute) 25. A lot of ……………… to New York are delayed because of the fog. (fly) 26. People in the whole town are ……………he victory of their football team now. (celebration) 27. All cigarettes packets carry a government health …………………. (warn) 28. At this time, ice cream couldn’t be …………………. bought in the store. (convenience) 29. My friend ate some …………………. mushrooms, so he had to go to the hospital. (poison) 30. Banyan trees ……………………. the Vietnamese country. (symbol) 31. The ………………. of the speech is enjoyed by all the people in this town. (free) 32. ………………………, the ghost isn’t existed. (science) 33. Despite the ………………… weather, thousands of soldiers helped protect this area. (storm) 34. Do you …………………….. meet each other after leaving school ? (occasion) 35. Do you often check your ………………… before travelling abroad ? (arrange) 36. Do you believe in …………………. between men and women ? (equal) 37. Earthquakes often come together with volcanic …………………… (erupt) 38. …………………… are trying their best to prevent air ………………. (environment / pollute) 39. Even if you have dark skin, you still need ………………… from the sun. (protect) 40. The planet of our ……………… system are Mercury, Venus, Earth and so on. (sun)

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