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cangkim82
2 năm trước
Cho ΔABC có AB = AC. Lấy 2 điểm D, E thuộc cạnh BC sao cho BD = DE = EC. Biết AD = AE. a) Chứng minh góc EAB = góc DAC b) Gọi M là trung điểm của BC. Chứng minh AM là phân giác của góc DAE c) Giả sử góc DAE = 60 độ. Tính các góc còn lại của ΔDAE
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