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2 năm trước
Cho hình chữ nhật ABCD. Qua E là một điểm bất kỳ nằm trên đường chéo AC, kẻ hai đường chéo FG // AD và HK//AB( F thuộc AB, G thuộc DC, H thuộc AD, K thuộc DC). Chứng minh rằng hai hình chữ nhật EFBK và EGDH có cung diện tích
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