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vuongdungk2
2 năm trước
Bài 1. Cho ABC vuông tại 4 có đường cao AH.a) Biết 4B = 6cm, BC = 10cm. Hãy tính độ dài các đoạn BH, CH AH, AC,b) Biết 4B V3cm. 4C → Tem. Hãy tỉnh độ dài các đoạn BC, AH, BH, CH.c) Biết BH = 16a, CH = 9a (a>0) Hãy tinh độ dài các đoạn AH, BC, AB, AC.d) Biết 48 = 154, AC=204(a>0). Hãy tinh đô dài đoạn AIBài 2. Cho A4BC vuông tại 1 có đường cao 41. Đặt BH = x(x > 0), hãy tỉnh x rồi suyra độ dài các đoạn 4/ và 4C nếu biết LB 3cm CH 320mBài 3. Cho A4BC vuông tại 4, về AH L BC tại H. Gọi HE và HF lần lượt là đường caocủa NBH và ACH. Chứng minh:a) BC²3AH² + BE² +CF².b) AH³= BC. BE.CF = BC.HE.HF
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