Giả phương trình: b)-2sin^2x+cosx+1

Mọi người ơi nhanh giúp e với ạ Cần gấp ý C lun ạ E hứa ctlhn +5sao+camon ạ

Giúp ml vs mn ơi. Mk đg cần gấp mn giúp mk vs nhan

a) 1 phút =……… giây; 3 phút = ……… giây ; 1/6 phút = …………. giây 60 giây = ……….phút; 8 phút = ……… giây ; 2 phút 10 giây .=…………. giây. b) 1 thế kỉ = ………… năm 2 thế kỷ = ……năm 1/5 thế kỉ = …………năm 100 năm =………thế kỉ 7 thế kỉ = …………năm 1/4 thế kỉ = ……… năm

Các nhân ơi giúp em nào :((( đúng nhé

Phương trình lượng giác cơ bản cos ²(2x+pi/4)=1/4

Có: (x^2 -2) chia hết cho (xy +2) = > y(x^2 - 2) chia hết cho xy+2 có suy ra được x(xy + 2) - 2(x+y) chia hết cho xy +2 ko

CT lewí của ion NO cộng, Cr2O72-, MnO4-

Giúp mk 2 bài này vs ạ. Mk đg cần gấp nên mn giúp mk vs nha

Bài 4: Điền giới từ thích hợp 1. Lan'll have a party ...................... Friday evening. 2. Would you like to come .......... my house ............lunch? 3. She takes care ............. her family. 4. She works .........a local supermarket. 5. My mother works...............the field............. my father. 6. Does your father work ............. . Hanoi? 7. David is good ................... . Math. 8. What do you do ............. your free time? 9. Are you interested ............. . sports?. 10. There's a good film ............. . ......... the moment. 11. Thanks .......... . your letter. 12. I'll see my mom and dad ................ . their farm. 13. We have to work hard .......... home and................ school 14. We'll visit her .......... Christmas. 15. Are you tired ............. . watching TV? 16. She often brings them ............... school. 17. He works .......... a factory. 18. We always go to Ha Long Bay .......... vacation. 19. Tell me more .......... . your family. 20. Can you send me a photo .......... . your family? 21. He goes .......... the city ............his wife. 22. It takes 18 hours to get .........Hanoi .......... coach. 23. We write .......... each other twice a week. 24. He is the president ...................... our club. 25. She spends most ...............the time ............. the couch .......... front ....... the TV. 26. What do you usually do ............. school? 27. Why don't you come ............. .? 28. They swap cards .......... their friends. 29. Will you play a game ................ . catch? 30. What do you do ................ . recess? 31. They usually have portable CD player ................ small earphones. 32. I'll take part................ your club. 33. They read or study ............. the same time. 34. We enjoy all ..................... our classes. 35. ............. school we study many things. 36. ............. . history, we study past and present events.......... . Vietnam and .........the world. 37. ............. . physics, we learn ............how things work. 38. She learns how to use a computer .......... . her Computer Science class. 39. Newspapers are .......... the racks ................ the middle. 40. Math books are ................ . the shelves .......... . the left. 41. The largest library is ..................Washington D. C, the capital .......... the USA. 42. Those books .......... the back ............the libraries are .........English. 43. Now, come and look ...............the kitchen. 44. My uncle is ............. . work now. 45. Can I see the rest .........the house? 46. She'll have a party .......... . her birthday. xinloi mik hết điểm rồi giúp mik đi :))