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tructrahoangthanh
2 năm trước
Giải giúp bài toán hình 9, Khó quá Cho ABCD là hình chữ nhật, AB > AD, vẽ CH vuông góc đường chéo BD tại H.AH kéo dài cắt BC tại E, CH cắt DE tại I ; BI kéo dài cắt CD tại F. Chứng minh : HD là phân giác của góc AHF
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