如图,在方格纸中(小正方形的边长为1),直线AB与两坐标轴交点A、B,根据所给的直角坐标系(O是坐标原点),解答下列问题: (1)分别写出点A、B的坐标,画出直线AB绕着点O逆时针旋转90°的直线A′B′; (2)若线段A′B′的中点C在反比例函数 y= k x (k≠0) 的图象上,请求出此反比例函数的关系式.
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