1.Trung bình cộng của 8 số là 6.Khi đó tổng của 8 số đó bằng a)14 b)24 c)48 d)7 2.Cho tam giác ABC cân tại A Trên cạnh AB lấy điểm D sao cho AD = BC = CB .khi đó số đo góc A là a)30 độ b)60 độ c)72 độ d)36 độ 3.Cho tam giác MNP Gọi I là giao điểm của ba đường phân giác số đo góc BIC là 115 độ tính số đo góc M a)115 độ b)130 độ c)50 độ d)150 độ

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