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thuhuyen3903
2 năm trước
Cho ΔABC vuông tại A, đường cao AH. a) Cho AB = 6cm; AC = 8cm. Tính BC b) Chứng minh ΔABC đồng dạng ΔHBA suy ra AB^2 = HB.BC. c) Tính HB;AH?
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