a) Cho \(y=2x^4+2mx^2-\dfrac{3m}{2}\). Tìm m để đồ thị hàm số có 3 điểm cực trị cùng với điểm O tạo thành 1 tứ giác nội tiếp.

b) Cho \(y=-2x^4-2mx^2+\dfrac{3m}{2}\). Tìm m để đồ thị hàm số có khoảng cách giữa 2 điểm cực đại bằng 5.

Giải thích tại sao khi tirixto đã thông dẫn thì hoạt động như 1 diot tiếp mặt?

a. Cho số thực x,y thoả mãn: \(x+y=2\left(\sqrt{x-3}+\sqrt{y-3}\right)\). Giá trị nhỏ nhất của biểu thức \(P=4\left(x^2+y^2\right)+15xy\)

b. Cho các số thực a,b,c thoả mãn \(\left\{{}\begin{matrix}-8+4a-2b+c>0\\8+4a+2b+c< 0\end{matrix}\right.\). Số giao điểm của đồ thị hàm số \(y=x^3+ax^2+bx+c\) và trục Ox.

Em thưa thầy, bài này thầy dùng quy tắc nào ở dòng đầu tiên ý ạ, em vẫn chưa hiểu lắm ạ!

1. They blamed Tom ___FOR_____ the failure of the discussion.

2. I have been brought __UP_____by my aunt since my parents passed ____AWAY_____

3. I came ___ACROSS______ this old picture while was looking back my old letters.

4. He spent six months catching up ___ON_____ his classmate after his sickness.

5. Tom came ___INTO (THỪA KẾ)________ a fortune of 20 million dollars when his father died.

6. The children are responsible ___FOR________ the broken window.

7. The children are to blame __FOR______ the broken window.

8. Ho Chi Minh was born ____ON_____ the second of September.

9. Surprisingly, he falls in love ___WITH________ my close friend.

10. Don’t be angry _AT/WITH________ your children ___FOR/ABOUT_____ this unimportant thing.

11. The meeting was put ___OFF_______ until next Friday because of bad weather.

12. There were more guests who showed ___UP______ at the meeting than I had expected.

13. Microsoft was set ___UP_______ by Bill Gate.

14. There is no surprise that the boy takes ____AFTER_______ his father.

15. If there is no sugar, I can do ___WITHOUT________ (sugar)

16. On the way to Vung Tau for a holiday, they dropped __IN/BY______ on me.

17. The synonym of “đối phó, giải quyết’ is cope ____WITH________.

18. When we are 18, we can be independent ___OF______ our parents.

19. She always takes pride ___IN________ her beauty.

20. The doctor told Jane to give ____UP________ sweets to lose weight.

21. He is standing ____AT____ the end of the bridge.

22. 400 people a year die of this disease ___ON______ average.

23. He is __IN___ trouble with his tutor.

24. ____OUT OF_____ sight, ____OUT OF_______ mind. (xa mặt. cách lòng)

25. He is not in the office. He is ____ON_______ business.

26. Rhinos are ___ON______ the verge of extinction.

27. Giant pandas are ____IN_____ danger/ ___AT_____ risk/ ___AT______ stake.

28. Never have I seen ghosts . (never = ___ON______ no account = ____UNDER/IN_____ no circumstances)

29. We can get this information ___FROM___ newspaper or ___ON_______ the Internet.

30. He became a professor ____AT______ the age of 24.

31. Customers can pay ___IN_____ cash or ____BY____ cheques.

32. ____FOR_____ the time being, John is our manager.

33. High school students are _____UNDER______ a lot of study pressure.

*34. Have to sign it ___FOR____ person. (đích thân)

35. I was bRought ____UP______ by my aunt because my parents passed ____AWAY_____.

36. ___MAKE________ a complaint __ABOUT SBD___ than phiền

37. ______MAKE______ allowances ___FOR______ = take account _____OF_____ : chiếu cố

38. _____CATCH____ sight ______OF______ ; bắt gặp, thấy

39. ____KEEP______ in touch ___WITH_________: giữ liên lạc 40. keep ___UP WITH_________ = catch ______UP WITH_________ = keep pace __WITH____ ; sánh kịp, đuổi kịp

41. have an ability ___to_______ 42. _____PAY______ attention _____TO_______ = take notice ____OF_____ : để ý

43. get rid ______OF______ ; loại bỏ

44. ___MAKE_______ use _____OF____; sử dụng, tận dụng

45. make fun ___OF_____

46. take advantage ____OF______