Cho đường thẳng (d): 2x-y+2=0 và A(6;0), B(5;2) a) Xét vị trí tương đối giữa OA và (d) b) Tính góc tạo bởi giữa đường thẳng AB và (d) c) Viết phương trình các cạnh của ΔABC cân tại C, biết C thuộc (d)

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