Cho tam giác ABC vuông .biết Ab =8cm AC=6cm 1. Tính BC 2. Tia phân giác của góc B cắt AC tại D. Kẻ DH vuông góc vsBC tại H Chứng minh DA DH 2. Trên tia đối của tia AB lấy E sao cho AE =AB Chứng minh AE=HC

Các câu hỏi liên quan

Task 1. Choose the word whose underlined part is pronounced differently from the others. 1. a. theater b. thanks c. there d. thirty 2. a. game b. animal c. channel d. national 3. a. watch b. channel c. children d. schedule 4. a. programme b. show c. popular d. home 5. a. newsreader b. weather c. week d. leave Task 2. Complete the sentences with suitable adjectives from the box. boring educational funny national popular entertaining clumsy cute 1. This is a very ___________ television programme. Millions of people watch it every week. 2. It was a really ___________ film. It made us laugh all the time! 3. Donald Duck is so ___________! I really love him. 4. VTV is the ___________ television broadcaster of Vietnam. 5. Channels like Discovery offer ___________ programmes that can increase our knowledge. 6. That‟s the third glass you‟ve broken this week - you‟re so ___________! 7. This programme is ___________ - Shall I turn over to BBC? 8. I found the talk show both informative and ___________. Task 3. Choose the correct answers. 1. Fruit tastes good _________ it‟s healthy for your body. a. but b. and c. so d. or 2. I want to buy a new jacket, _________ I don‟t have enough money. a. and b. so c. but d. because 3. Linda is going to make a cake, _________ she needs some eggs and flour. a. so b. but c. and d. or 4. We went for a walk _________ it was raining heavily. a. because b. although c. therefore d. however 5. We can go to the pool _________ we can go horse-riding, whichever you prefer? a. or b. but c. and d. so 6. John likes funny movies _________ he doesn‟t like scary movies. a. and b. or c. so d. but 7. I‟d like to see that Korean band _________ their music is pretty cool. a. although b. so c. because d. but 8. I still cry at the end _________ I‟ve seen this movie several times. a. and b. although c. because d. so 9. You must hurry _________ you will miss your train. a. so b. but c. and d. or 10. His chocolate was too hot, _________ he put some cold milk in it. a. so b. but c. because d. although