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a,Chứng minh rằng a^3+b^3+c^3-3abc=(a+b+c)(a^2+b^2+c62-ab-bc-ca). Từ đó hãy cho biết mối quan hệ giữa các số a,b,c nếu a^3+b^3+c^3=3abc b,Cho a,b,c là các số thực khác 0 sao cho: a^3b^3+b^3c^3+c^3a^3=3a^2b^2c^2. Hãy tính giá trị biểu thức M=(1+a/b)(1+b/c)(1+c/a). c,Tìm số abcd biết rằng abcd+bcd+cd+d=4574
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Exercise 3: Complete the sentences with Preposition of Time 1. Mozart was born ______ Salzburg ______ 1756. * 2. They got married ______ April 2002. * 3. I'm usually free ______ 8 pm and 10 pm. * 4. What do you usually do ______ Sunday? - We often go for long walks in the country ______ weekends or ______ holidays. * 5. The course begins ______ 12 May and ends sometimes ______ August. * 6. She works hard ______ the week, so she likes relaxing ______ weekend. * 7. I'll leave ______ 7 o'clock, so you should call me ______ 7. * 8. My English class finishes ______ 7.30. Let's meet ______ 7.30. * 9. Do you give each other presents ______ Christmas? * 10. There are usually a lot of parties ______ New Year's Eve. * 11. He asked me to come ______ 11:30, not ______ noon. * 12. I suddenly felt ill ______ the examination. * 13. The book was easy to read, so I read it ______ a day. * 14. She started dancing ______ 8 and now she is a great star. * 15. Call me again ______ 11 o'clock because my classes will finish ______ 11:00. * 16. Did you phone your teacher the day ______ yesterday? * 17. My parents will get back from their holiday the day ______ tomorrow. * 18. Mr. Brown enjoys walking around his garden ______ night. * 19. Let's wait ______ it stops raining. * 20. He took a boat and reached the island ______ half an hour. * 21. My mother used to wear long dresses ______ special occasions. * 22. The bills always arrive ______ the first of the month. *
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