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p_hoangtumotmi
2 năm trước
Cho tam giác ABC không cân, nội tiếp đường tròn (O;R). Gọi H là trực tâm và I, K lần lượt là chân đường cao kẻ từ A, B. Gọi M là trung điểm của BC. Kẻ HJ vuông góc với AM. Chứng minh A, H, J, K cùng thuộc 1 đường tròn và ∠IHK = ∠MJK.
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People may have many different types of hobbies during their lifetime. When we are very young most of our time is spend playing with dolls or toy trucks. We also may enjoy playing in a sandbox or building with wooden blocks. When we get older, we start to pursue our first hobbies. Some kids go out for a sport like football or figure skating. These new interests can be quite time-consuming and most children put a lot of energy into them. Some other children might get interested in less active activities like reading, painting, or stamp collecting. While some others might enjoy playing an instrument like the piano or the flute. As we get older, our hobbies might change or they might not. Some people who collected stamps as a child might still be collecting stamps when they are 80. Other people might change their interests every year depending on fashion. Some people are lucky that they have found professions that are similar to their hobbies, like the weekend gardener who works as a landscaper or the kid who loves computers and becomes a programmer. 1. What do people often do when they are very young ? 2. Do most children put a lot of energy into football and figure skating ? 3. What kinds of instrument might some children enjoy playing ? 4. Can a man collect stamps when he is 80 ? 5. Are there professions which are developed from hobbies ?

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