user-avatar
hoakull
2 năm trước
Cho tâm giác bác vuông tại a (ab <ac)gọi m là trung điểm của bc. Trên tia đối của tia ma lấy điểm d sao cho md=ma.a chứng minh tứ giác abdc là hình chữ nhật.b gọi e là điểm đối xứng của c qua a. Chứng minh tứ giác adbe là hình bình hành.c em cắt ab tại k và cắt CD tại i. Vẽ ih vuống góc với ab(h thuộc ab). Chứng minh tâm giác ikb cân
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Giúp vs............??? Chia những độngtừ trong ngoặc với thì hiện tại đơn,tuong lai đơn,tương lai gần, hiện tại tiếp diễn ,quá khứ đơn 1. A: Why are you holding a piece of paper? B: I (write) ............................ a letter to my friends back home in Texas. 2. A: I'm about to fall asleep. I need to wake up! B: I (get) .............. you a cup of coffee. That will wake you up. 3. A: I can't hear the television! B: I (turn) .............. it up so you can hear it. 4. We are so excited about our trip next month to France. We (visit) .............. Paris, Nice and Grenoble. 5. Ted: It is so hot in here! Sarah: I (turn) .............. the air-conditioner on. 6. I think he (be) .............. the next President of the United States. 7. After I graduate, I (attend) .............. medical school and become a doctor. I have wanted to be 8. John: Wow, it's freezing out there. Jane: I (make) .............. some coffee to warm us up. Do you want a piece of pie as well? John: Coffee sounds great! But I (have) .............. dinner with some friends later, so I'd better skip the pie Jane: I (go) .............. to dinner tonight too, but I'm having a piece of pie anyway. 9. What terrible traffic! Just look at the long queue. We .............. (miss )our flight. 10. I .............. (send )Alex your letter when I see her tomorrow. 11. The board of directors have reached the final decision. Harrison .............. (lead) the marketing team from next month. 12. I hope you ..............( visit )my new house in Charlington some time. 13. In the future, many young people ..............( start )up their own businesses. A. will 14. The sky is blue. It ..............(be) another hot day. . Let's go out. It (not/ rain) now. 15. Julia is very good at language. She (speak) four language very well. 16. Hurry up! Everybody ...... (wait) for you. 17. '...... (you/listen) to the radio?' 'No, you can turn it off'?' 18. '...... (you/listen) to the radio every day?' "No, just occasionally?" 19. The River Nile ...... (flow) into the Mediterrancan. 20. The river ...... (flow) very fast today - much faster than usual. 21. We usually ...... (grow) vegetables in our garden, but this year we ..... (not/grow) any. 22. Rachel is in London at the moment. She ...... (stay) at the Park Hotel. She always ...... (stay) there when she's in London. 23.My children (not do) their homework last night. 24. You (live) here five years ago? 25.They (watch) TV late at night yesterday. 26.Your friend (be) at your house last weekend?

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