Câu hỏi Tự Luận

Cho tam giác ABC cân tại A, đường phân giác BD. Tính độ dài BD |

Câu hỏi:

Cho tam giác ABC cân tại A, đường phân giác BD. Tính độ dài BD biết rằng BC = 5 cm, AC = 20 cm.

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