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honghiepc3dongthanh
2 năm trước
Cho tam giác ABC vuông tại A có AB < AC trên canh BC lấy D sao cho BD = BA. Kẻ AH vuông góc với BC kẻ Dk vuông góc với AC. a) chứng minh góc BAD = góc BDA b) AD là phân giác góc HAC c) AK = AH d) AB + AC < BC + AH
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