user-avatar
nhtbangchu
2 năm trước
tư một điểm M nằm ngoài (O),vẽ 2 tiếp tuyến MA,MB với đường tròn.Trên cung nhỏ AB lấy 1 điểm C.Vẽ CD vuông góc với AB,CE vuông góc với MA,CF vuông góc với MB.Gọi I là giao điểm củaAC và DE,K là giao điểm của BC và DF.CMR: a) Tứ giác AECF nội tiếp,tứ giác BFCD nội tiếp b)CD.CD=CE.CF c) Tứ giác ICKD nội tiếp d) IK vuông góc với CD
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Giúp với mọi người!!! 《 bài khanh ạh 》 Bài 1. Choose the correct option for each gap in the sentences. Question 16: …………. he spent much money on the film, it wasn't a big success. A. Even B. But C. Although D. Despite Question17:I enjoyed the film on TV yesterday evening .......nobody in my family liked it. A. although B. yet C. in spite of D. so Question 18: We didn't find it funny………..it was a comedy. A. in spite of B. despite C. although D. but Question 19: I went to the cinema with my friends yesterday … feeling very tired. A. although B. in spite of C. but D. so Question 20: … careful preparation, we have a lot of difficulties in making a new A. With B. However C. Such D. Despite Question 21: Let's go to the Victor Cinema. I'm sure you'll find the film………… A. excites B. excite C. excited D. exciting Question 22: I have never felt as ………… as I did when I watched that horror film. A. terrify B. terrified C. terrifying D. terrible Question 23: We like the film very much. The… are unforgettable and the plot is gripping. A. characters B. acting C. style D. action Question 24: The film was so …… However, my father saw it from beginning to end. A. interesting B. exciting C. boring D. fascinating Question 25: I was …. to learn that the director of that gripping film has won the first prize. A. interest B. interests C. interested D. interesting

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