Cho tam giác ABC vuông tại A. AH vuông góc với BC tại H. Trên tia đối của tia HB lấy điểm D sao cho HB=HD; AB<AC;DE vuông góc với AC tại E. HK vuông góc với AC tại K, M là trung điểm của CD.CM: góc HEM= 90 độ

giúp với....................................................

giúp mình với các bạn ơi . helppppppppppp

Vẽ sơ đồ tư duy kiến thức chương 1 Hóa 8 giúp em nha mn! Hứa vote 5*+camon

giải giúp mik Bài 2: Cho tam giác ABC cân tại A, , kẻ BD vuông góc với AC tại D, kẻ CE vuông góc với AB tại E. Gọi K là giao điểm của BD và CE. Chứng minh rằng: a) b) c) AK là phân giác của d) Ba điểm A, K, I thẳng hàng (Với I là trung điểm của BC) nhanh nha mấy bạn , mình cần gấp , ko cần hình nha

Giúp em với em cần gấp ạ. Câu 2, 3 thôi ạ

VI. Read the following passage carefully, then make questions from the suggestions and answer them. We can develop alternative sources of energy, and unless we try we’ll never succeed. Instead of burning fossil fuels we should be concentrating on more economic uses of electricity, because electricity can be produced from any sources of energy. If we didn’t waste so much energy, our resources would last longer. We can save more energy by conservation than we can produce for the same money. Unless we do research on solar energy, wind power, tidal power, hydroelectric plants our fossil fuels will run out and we’ll all freeze or starve to death. Many countries are spending much more time and money on research because the energy from the sun, the waves and the winds last forever. We really won’t survive unless we start working on cleaner and safer sources of energy. 1. What/ electricity/ produce/ from? ………………………………………………………………………………………………… 2. What/ happen/ if/ we/ not waste/ so much/ energy? ………………………………………………………………………………………………… 3. What/ happen/ unless/ we/ do research/ solar energy/ other alternative sources/ energy? ………………………………………………………………………………………………… 4. Why/ countries/ spend/ much more/ time/ money/ do research/ energy/ sun/ waves/ winds? ………………………………………………………………………………………………… 5. What/ happen/ unless/ we/ start/ work/ cleaner/ safer/ sources/ energy? …………………………………………………………………………………………………

jup em vs a em xin cam on rat nhieu

Tìm m sao cho pi/4 + k2pi là nghiệm của phương trình sin^4x + cos^4x + msin2x + sin^3x=0.

Hoàn thành những câu hỏi đuôi sau 8. That is your umbrella, ______? 9. Those aren't Fred's books, ______? 10. Something is wrong with Jane today, ______? 11. Everyone can learn how to swim, ______? 12. Nobody cheated in the exam, ______? 13. Nothing went wrong while I was gone, ______? 14. I am invited to your party, ______? 15. He'd better come to see me, ______? 16. He seldom visits you, ______? 17. You’ve never been in Italy, ______? 18. No one died in the accident, ______? 19. Going swimming in the summer is never boring, ______? 20. What nice gifts, ______? 21. Don't talk in class, ______? 22. Sit down, ______? 23. Nobody called the phone, ______? 24. Everything is okay, ______? 25. You have to leave early, ______? 8. That is your umbrella, ______? 9. Those aren't Fred's books, ______? 10. Something is wrong with Jane today, ______? 11. Everyone can learn how to swim, ______? 12. Nobody cheated in the exam, ______? 13. Nothing went wrong while I was gone, ______? 14. I am invited to your party, ______? 15. He'd better come to see me, ______? 16. He seldom visits you, ______? 17. You’ve never been in Italy, ______? 18. No one died in the accident, ______? 19. Going swimming in the summer is never boring, ______? 20. What nice gifts, ______? 21. Don't talk in class, ______? 22. Sit down, ______? 23. Nobody called the phone, ______? 24. Everything is okay, ______? 25. You have to leave early, ______?