Bài 2. Cho tam giác ABC cân tại A và đường cao AH (H thuộc BC). Chứng minh: a) HB = HB b) ∠(HAB) =∠(HAC)

giúp mik tí [ Nếu chiếu một tia sáng từ không khí vào nước với góc tới bằng 450 thì góc khúc xạ ; ]

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Mọi người giúp mình vs ạ Cảm ơn

Làm giúp mình đi mình cảm ơn Please

Combine sentences into a new one using “enough” 1. This soup is warm. We can eat it.  2. These oranges are ripe. You can eat them.  3. This morning was very cold. We couldn’t go swimming. 4. She can't carry the box; it’s very heavy.  5. The room was very dirty. Nobody can learn in it. 6. It was very late. She could go home. 7. The teacher felt better. She could explain the lesson. 8. They can’t sleep. They aren’t tired.  9. She couldn’t see the film because it was very boring.  10. She is old, so she can drive a car. 11. All students had to stay at home because it rained heavily.  12. You can catch any taxi to the airport because it is very early.  13. The truck can go through the gate because it is very wide.  14. Tom was very brave boy, so all his friends admired him. 15. The room was very comfortable. We all fell asleep easily. 16. It was very cold. They couldn’t keep working in the field.  17. He spoke slowly. We could understand him. 18. The fair was very noisy. We couldn’t hear each other.  19. The soup is very excellent. We will have some.  20. They were very tired, so they stopped working.

Rewrite sentences without changing the meaning. Use the word-class indicated and make any other necessary changes to the sentence. 1. For Christians, Christmas is a celebration of the birth of Jesus Christ. VERB For Christians, Christmas celebrates of the birth of Jesus Christ. 2. The festival events included parades, sports and musical gatherings. NOUN (plural) _________________________________________________________________________ 3. There was a feeling of celebration about the whole weekend. ADJECTIVE _________________________________________________________________________ 4. For the country people, the spring festival symbolically renews the fertility of the land. NOUN _________________________________________________________________________ 5. There was an atmosphere of ceremony as the military bands marched round the main square. ADJECTIVE _________________________________________________________________________ 6. People tend to be in a mood for having a festival when the harvest is successfully completed. ADJECTIVE _________________________________________________________________________ Giúp mình với mình sắp phải nộp r

Tính đến năm 2020, Đảng bộ quận Ba Đình đã trải qua bao nhiêu kỳ Đại hội? * A. 24 B. 25 C. 26 D. 27

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Câu 1: Lập bảng niên biểu những hoạt động của Nguyễn Ái Quốc ở nước ngoài từ năm 1911-1925? Câu 2: Kể tên ba tổ chức Cộng sản ra đời năm 1929. Tại sao nói: Sự ra đời của ba tổ chức cộng sản vào năm 1929 là một xu thể tất yếu của cách mạng Việt Nam? ai giải giúp mình 2 câu này với