user-avatar
quynhnguyen10
2 năm trước
Cho △ ABC có 3 góc nhọn nội tiếp đường tròng ( O ). 3 đường cao AK, BE, CD cắt nhau tại H. a) Chứng minh: Tứ giác BDEC nội tiếp b) Chứng minh: AD . AB = AE . AC c) Gọi I, K là trung điểm của BC, DE. Chứng minh: OA // IJ
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

IV. Finish each of the following sentences so that its meaning stays the same. 1. Follow these safety instructions or you may get burnt. → If you ____________________________________________________________ 2. I suggest having some spaghetti and pizza tonight. →Why don't ______________________________________________________ 3. My aunt has never tasted sushi before. → This is ________________________________________________________ 4. Eating healthy food is very important. → It is __________________________________________________________ 5. Do more exercise or you can't lose any weight. → If ____________________________________________________________ 6. Although Jimmy was stronger of the two, his attacker soon overpowered him. → Despite his ________________________________________________________ 7. I don't intend to change my eating habits. →I have _____________________________________________________________ 8. If I follow the doctor's advice of eating diet, I can improve my health problems soon. → The sooner ________________________________________________________ 9. You need to peel the onion and slice it. →The onion __________________________________________________________ 10. The manager usually threatens not to select Brian for the team unless he trains harder.

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