Từ điểm M nằm ngoài đường tròn (O;R) vẽ hai tiếp tuyến MA và MB và cát tuyến MCD với (O) ( A, B là tiếp điểm và cát tuyến MCD nằm trong góc AMO, MC< MD). Gọi H là giao điểm của OM và AB. a) chứng minh AC.BD = AD.BC b) tiếp tuyến tại C của (O) cắt MB tại E. Gọi I là hình chiếu vuông góc của E lên đường thẳng MO. chứng minh A, C , I thẳng hàng

Các câu hỏi liên quan

Giúp em vs mấy chuyên gia tiếng anh ơi ! I’m 18 years old and have never played on a sports team before, so I never received lessons or training of any kind. I wish my parents had signed me up for soccer when I was younger because I discovered that I wanted to play sports. I just have no skills. There is a soccer team at my high school, but I definitely won’t make it. Most people on the team have probably been playing for years. I feel like I missed my chance and that I’ll never be as good as them. Is it too late for me to learn to play from scratch? I just 𝗳𝗶𝗴𝘂𝗿𝗲 that by the time I become “good”, I’ll be too old anyway. I tried teaching myself in the past, but 𝗶𝘁 seemed too unorganized and I didn’t know what I was doing. Is there some places that teaches people of any age how to play soccer? Question 28. Why does the writer write this passage? * 1 điểm A. He wants to study how people play soccer B. He is trying to apply for a soccer team C. He needs advice on whether he should start learning soccer. D. He has received a sport award for playing in a soccer game. Question 29. What can be inferred from the passage about the writer? * 1 điểm A. His parents forgot to sign up the writer for a soccer team. B. He has never played on a soccer team before. C. His friends have all participated in some sports teams. D. He envies those who can play soccer well. Question 30. The word ‘𝗳𝗶𝗴𝘂𝗿𝗲’ closest in meaning to________ _. * 1 điểm A. think B. want C. trust D. choose Question 31. The word ‘𝗶𝘁’ refers to______. * 1 điểm A. being too old to learn B. teaching himself how to play soccer C. playing for many years D. looking for a good coach Question 32. What will the writer probably do? * 1 điểm A. Teach himself again to play soccer B. Find a job instead of play soccer C. Ask his friends to teach him soccer D. Look for a place that teaches adults soccer