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truonghangmamnon
2 năm trước
Cho tam giác ABC vuông tại A, M là trung điểm của cạnh BC. Trên tia AM lấy điểm D sao cho MD=MA a) CD=AB b) AC vuông góc với CD c) AM = 1/2 BC d) giả sử góc C= 30 độ, chứng minh BC=2.AB
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