Cho hình chữ nhật $ABCD$ . Đường thẳng $AC$ có pt : $x-7y+14=0$ , đường thẳng $AB$ có pt $x-2y-1=0 $.đường chéo $BD$ đi qua $M(2,1)$ . Tìm toạ độ $A, B,C, D$
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