Trong hệ tọa độ Oxy, cho hình vuông ABCD có đỉnh C thuộc đường thẳng (d):x+2y−6=0, điểm M(1;1) thuộc cạnh BD. Biết rằng hình chiếu vuông góc của điểm M trên cạnh AB và AD đều nằ trên đường thẳng Δ:x+y−1=0. Tìm tọa độ đỉnh C. 

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