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2 năm trước
Cho ∆"ABC nhọn, kẻ AH vuông góc với BC (H thuộc BC)." Cho biết AC = 20 cm, AH = 12cm, BH = 5cm. Tính độ dài cạnh HC, BC, AB.
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V. Đọc đoạn văn sau và trả lời các câu hỏi bên dưới: Hoa’s father, Mr. Tuan, is a farmer. He usually starts work at six in the morning. He has breakfast, then he feeds the buffalo, pigs and chickens, and collects the eggs. From about nine in the morning until four in the afternoon, Mr. Tuan works in the field with his brother. They grow some rice, but their main crop is vegetables. From 12 to 1 o’clock, Mr. Tuan rests and eats lunch. At four in the afternoon, they come back home. Mr. Tuan feeds the animals again. Then he cleans the buffalo shed and the chicken coop. His work usually finishes at six. Four or five times a year when there is less work, Mr. Tuan takes a day off. He goes to the city with his wife. A farmer has no real vacation. 1. What time does Mr. Tuan usually start work in the morning? ………………………………………………………………………………… 2. What does he do after breakfast? ………………………………………………………………………………… 3. How long does he work in the field? ………………………………………………………………………………… 4. How long does he rest and eat lunch? ………………………………………………………………………………… 5. How often does he go to the city? ………………………………………………………………………………

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