Câu 2 (3,5 ?i?m) Cho tam giác ABC có AB = 3cm, AC = 4cm, BC = 5cm. Tia phân giác góc B c?t AC t?

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Câu 2 (3,5 ?i?m) Cho tam giác ABC có AB = 3cm, AC = 4cm, BC = 5cm. Tia phân giác góc B c?t AC t?i D. K? DE ? BC(E ? BC). a) Tam giác ABC là tam giác gì? Vì sao? b) Ch?ng minh: ?BDA = ?BDE. c) G?i M là giao ?i?m c?a DE và AB. Ch?ng minh tam giác BMC cân.