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thaonguyennguyen184
2 năm trước
Cho tam giác ABC vuông cân tại A, biết AB = AC = 4cm. a) Tính BC. b) Kẻ AD vuông góc với BC. CMR: D là trung điểm của BC. c) Từ D kẻ DE vuông góc với AC. CMR: Tam giác AED vuông cân. d) Tính AD.
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