Bài 5. CMR nếu (n,6)=1 thì (n-1).(n+1) chia hết cho 24. (Với neN)

giúp voứi ạ,.............................

Cho ABC nhọn với đường cáo BE,CF căt nhau tại H. C/m A,H,E,F nằm trên 1 đg tròn Gọi M là trung điểm BC. C/m ME,MF là tiếp tuyến đg tròn đó

1.Nguyên nhân vì sao dân cư tập trung đông ở khu vực Nam Á,đông nam á,tây âu 2.Khu vực thưa dân,tại sao khu vực đó thưa dân 3,căn cứ vào đâu để chia ra các chủng tộc trên thế giới cảm ơn

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Em cần gấp ạ ai giúp e vs ạ e cảm ơn

SUPPLY THE CORRECT FORM OF THE WORD IN BRACKETS: 1. People in my country are very warm and ________________. ( friend ) 2. An _______________ is a child whose parents are dead. ( orphanage ) 3. L.A. Hill is a ________________ writer. ( humor ) 4. She looks more _________________ than her sister. ( beauty ) 5. I am _______________ enough to have a lot of friends. ( luck ) 6. They enjoyed the _________________ summer evenings in the countryside. ( peace ) 7. It was _________________ of him to offer to pay for us both. ( generosity ) 8. Bao is very ________________ , kind and generous. ( social ) 9. After his parents died, he was sent to an ________________. (orphan ) 10. Huy makes friends very easily because he is very _____________. ( social ) 11. We like our English teacher of his sense of _______________. ( humorous ) 12. Thank you for your _______________ behavior. ( generosity ) 13. Ba often tells jokes. He is a ______________ boy. ( humor ) 14. I love the ______________ of the summer evenings in the countryside. ( peaceful ) 15. No one likes him because he is _______________. ( friend ) 16. This led to the _______________ of the telephone. ( invent ) 17. Alexander Graham Bell was a great _______________. ( invent ) 18. The life in the countryside makes us relaxed because it’s very _______________. ( peace ) 19. _______________, he passed the exam. ( Lucky ) 20. _______________, he lost the game. ( Lucky ) 21. _______________, no one was injured in the fire last night. ( Lucky ) 22. _______________, the barber cut my hair too short. ( Luck) 23. Faraday is one of the greatest ________________ in history. ( invent ) 24. My friend Phuong Anh enjoys doing ______________ work. ( society ) 25. How was television ______________ ? ( invent ) 26. Michael Faraday made a lot of ____________________ in the field of electricity. ( invent) 27. Nam’s _______________ makes him different from others. ( generous ) 28. Her sister plays the violin very ______________. ( beautiful ) 29. Lam’s _________________ of books is attractive. ( arrange ) 30. Alexander Graham Bell _________________ demonstrated his invention. ( success ) Giúp mình với ạ mình cần gắp

6. Số proton của Cl là bao nhiêu?

GIÚP EM CÂU NÀY CẦN GẤP EM CẢM ƠN NHIỀU :)))

Hỗn hợp khí A chứa N2 và H2 theo tỉ lệ về thể tích là 1 : 4. Cho hỗn hợp A đi qua xúc tác nung nóng, có phản ứng: N2 + H2 → NH3 (khí) xảy ra, sau phản ứng thu được hỗn hợp khí B. Tính tỉ lệ khối lượng riêng giữa hỗn hợp A và hỗn hợp B