若矩形ABCD的边AB所在直线方程为3x+4y-8=0,定点B的坐标为(0,2),点D的坐标为(5,4.5)若矩形ABCD的边AB所在直线方程为3x+4y-8=0,定点B的坐标为（0,2）,点D的坐标为（5,4.5）求（1）边CD,BC所在的直线方程（

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