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Cho tam giác ABC có góc ABC=55 độ. Trên cạnh AC lấy điểm D (DC trùng với A và C ). Biết góc ABD=30 độ. a)Tính độ dài AC, biết AD=4cm và CD=3cm b)Tính số đo góc DBC c)Từ B dựng tia Bx sao cho góc DBx=90 độ. Tính ABx
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