1 +sinx +cosx +sin2x +cos2x= 0 🙏

giải giúp mk với , mỗi bạn 1 câu thui cx đc p= $\frac{\sqrt{x}}{\sqrt{x}-\sqrt{y}}$-$\frac{2\sqrt{x}}{\sqrt[]{x}+\sqrt{y}}$- $\frac{y-3\sqrt{y}}{y-x}$

Khối 6 của một trường có 96 học sinh xếp loại học lực gồm 4 loại: Giỏi, khá, trung bình, yếu. Trong đó 1/12 số học sinh giỏi, 25% số học sinh khá, 5/8 số học sinh trung bình, số học sinh còn lại là yếu. Tính số học sinh xếp loại giỏi, khá, trung bình, yếu của khối 6.

Tại sao đấu tranh giai cấp làm động lực để phát triển xã hội ?Cho ví dụ ? (Hạn chế lấy trùng trên mạng ).Em thanks !!!! _Môn Triết_

Mn giúp em vs em cần gáp Em cảm ơn Gthik tại sao chọn đáp án đó

Đề bài rút gọn biểu thức, mng giúp e với em tặng 20 sao

1. That brown suitcase ................ to Dr. Smith .a. belongs b. has belonged c, is belonging d. belonged 2. We’ll go out when the rain ......................... a. stopped b. will stop c. stops d, had stopped 3. I …………for Christine. Do you know where she is? a. look b. looked c. am looking d. looks. 4. At 5 o’clock yesterday evening, I ……………my clothes. a. am ironing b. have ironed c. ironed d. was ironing. 5. Are you ready, Ann? Yes, I……………… ..a. am coming b. come c. came d. have came. 6. I ………………..along the street when I suddenly heard footsteps behind me. a. was walking b. am walking c. walk d. walked. 7. She ………….German for two years. a. has learnt b. is learning c. learn d. learns. 8. When I last………..Jane, she ………..to find a job .a. see/was trying b. saw/was trying c. have seen/tried d. saw/tried. 9. I ……………at 8 o’clock every morning. a. was getting up b. got up c. is getting up d. get up 10. Ann …………..tea very often. a. doesn’t drink b. don’t drink c. didn’t drink d. hasn’t drunken. 11. The sun …………….in the East. a. is rising b. rose c. has risen d. rises. 12. The swimming pool………………at 9 o’clock and …………at 18.30 every day .a. opens/closes b. opens/closed c. opened/closed d. opened/closes 13. Bad driving often……………..many accidents. a. caused b. have caused c. causes d. had caused 14. What time ………….the banks close in Britain a. do b. did c. does d. can. 15. Look! That man………….to open the door of the car. a. try b. tried c. is trying d. has tried. 16. When I was young, I ………………to be a singer. a. have learnt b. am learning c. had learnt d. learnt. 17. I …………….lots about the job so far. a. have learnt b. am learning c. had learnt d. learnt. 18. They…………me about it last week. a. was telling b. told c. had told d. would tell 19. I hope everything…………..fine. a. is b. was c. would be d. will be 20. My grandfather………….many tears ago. a. had died b. has died c. died d. was dying 21. I………………my son the money for that last week .a. gave b. given c. have given d. was given 22. Where …………..you at 9:00 last night, Mr. Green? a. have been b. were c. will be d. are 23. Last year they ………….22 million TV sets. a. were selling b. had sold c. has sold d. sold 24. I think you…………….pay to park here. I ‘ll just go and read that notice. a. will b. would c. must d. better 25. Ted and Marry………………….for 24 years .a. have been married b. married c. were married d. has been married. 26. I think the weather…………………nice later. a. will be b. be c. is d. has been 27. We ………….a party last Sunday. It was great we invited lots of people. a. have b. have c. had. d. had had 28. I ……………..Peter today. a. not have seen b. do not see c. have not seen d. was not seeing 29. My brother …………………me for weeks . a. hasn’t phoned b. didn’t phoned c. isn’t phoning d. not phoned 30. How…………..have you known each other? a. already b. for c, long d. since Làm đc mik cho 5 sao và ctlhn

chỉ cần làm câu 4 thôi ạ em can gap moi nguoi giup em voi em cam ơn ạ

2: Cho tam giác ABC cân tại A. Kẻ phân giác góc BAC cắt BC tại D. Gọi I là trung điểm cạnh AC và E là điểm đối xứng của D qua I a) Chứng minh: AD vuông góc với BC tại D. b) Chứng minh tứ giác AECD là hình chữ nhật.

Đề bài rút gọn biểu thức ạ, mng giúp em với em tặng 20 sao