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1. Cho tam giác ABC cân tại A, các đường phân giác BD, CE (D thuộc AC, E thuộc AB). Chứng minh BEDC là hình thang cân có đáy nhỏ bằng canh bên 2. Hình thang ABCD (AB//CD) có ∠ACD = ∠BDC. CM rằng ABCD là hình thang cân. *BT 22 và 24sgk trang 80 Không lấy đáp án có sẵn trên các web giải đề
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