user-avatar
275521960134065
2 năm trước
Cho ΔABC vuông tại A ( AB<AC) Vẽ BD là tia phân giác của ABC và D thuộc AC.Trên cạnh BC lấy E sao cho BE=BA a) Chứng minh ΔBDA=BDE và DE ⊥ BC b) Tia ED cắt tia BA tại K.Cm ΔADK= ΔEDC và KA=CE c) Gọi I là trung điểm của KC.Chứng minh B,D,I thẳng hàng
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

2. Would you get on the …………, please? I need to weigh you. A. table B. scales C. chair D. bed * 1 điểm A B C D 3. Yesterday, I didn’t go to school because I had a…………. A. cold B. headache C. toothache D. A, B, C are correct * 1 điểm A B C D 4. Your temperature is 37 degree Celsius. It’s ………………………..A. normal B. usual C. not good D. awful * 1 điểm A B C D 5. The weather is awful today, so you………….stay inside.A. should not B. should C. can not D. must not * 1 điểm A B C D 6. A: “How……………….are you?” – B: “ I’m 40 kilos”A. tall B. old C. heavy D. A, B, C are correct * 1 điểm A B C D 7. Would you please …………………..your medical record? A. fill in B. write for C. talk to D. get on * 1 điểm A B C D 8. What’s wrong …………..you?A. to B. for C. on D. with * 1 điểm A B C D 9. …………..you absent from school yesterday? A. Do B. Were C. Are D. Have * 1 điểm A B C D 10. We should have a medical………………….once a year. A. exam B. checking C. survey D. check-up * 1 điểm A B C D 11. I need to know your height. ……………were you last year? A. How old B. How tall C. How heavy D. How often * 1 điểm A B C D 12. Yesterday, Hoa and her aunt …………..to the market. A. went B. go C. goes D. going * 1 điểm A B C D 13. You can buy some spinach at a…………………stall. A. vegetable B. fruit C. book D. meat * 1 điểm A B C D 14. Let’s buy some fruit for our dinner? A. Good idea B. You’re welcome C. Not bad D. I’m fine * 1 điểm A B C D 15. Lan doesn’t like durians and …………………does her sister.A. either B. neither C. so D. to * 1 điểm A B C D 16. I like carrots and my sister does,…………….. A. so B. too C. either D. neither * 1 điểm A B C D 17. Hoa feels sick because she ate too…………….candy last night. A. much B. many C. a lot of D. little * 1 điểm A B C D 18. My sister is a good student……….. does my brother. A. Neither B. Either C. So D. Too * 1 điểm A B C D 19. There is ______________milk in the bottle. A. more B. many C. a few D. a little * 1 điểm A B C D 20. There is a wide selection of meat_______ display. A. in B. on C. at D. for * 1 điểm A B C D

The Causes of Floods Floods are second only to fire as the most common of all natural disasters. They occur almost everywhere in the world, resulting in widespread damage and even death. Consequently, scientists have long tried to perfect their ability to predict floods. So far, the best that scientists can do is to recognize the potential for flooding in certain conditions. Melting snow, occurring with heavy rain and sudden warmer weather, creates a large amount of water. If there is a fast snow melt on top of frozen ground, flooding is more likely to occur than when the ground is not frozen. Frozen ground cannot absorb the additional water created by the melting snow. Melting snow also contributes to high water levels in rivers and streams. Whenever rivers are at their full capacity of water, heavy rains will result in the rivers overflowing and flooding the surrounding land. Rivers that are covered in ice can also lead to flooding. When ice begins to melt, the surface of the ice cracks and breaks into large pieces. These pieces of ice move and float down the river. They can form a dam in the river, causing the water behind it to rise and flood the land upstream. If the dam breaks suddenly, the large amount of water held behind the dam can flood the areas downstream too. Answer the following question with a SHORT answer OR a LONG one. What is the most common of all natural disasters? --> _______________________________________________________________ What can floods result in? --> _______________________________________________________________ When does melting snow make a large amount of water? --> _______________________________________________________________ What happens as ice begins to melt? --> _______________________________________________________________ What is “it” in the last paragraph? --> _______________________________________________________________

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team