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thuyhale78
2 năm trước
cho tam giác ABC cân có AB=AC=5cm.Gọi H là trung điể của BC, HE vuong góc với AB, HF vuông góc với AC a: chứng minh tam giác ABH= tam giác ACH B: tam giác AHE=tam giác AEH và tam giác AEF cân c: BC= 6cm; Tính AH?
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