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namyeutoannhieulam
2 năm trước
Cho tam giác ABC. M là trung điểm AC. Trên tia đối của tia MB lấy điểm D sao cho BM = MD. 1. Chứng minh : ΔABM = ΔCDM. 2. Chứng minh : AB // CD 3. Trên DC kéo dài lấy điểm N sao cho CD =CN (C ≠ N) chứng minh : BN // AC.
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