设A(x1,y1)在曲线xy=-1上,则满足x1y1=-1当曲线xy=-1绕坐标原点逆时针旋转45°后,A’点坐标为（x2,y2）则x2=x1cos45°-y1sin45°=√2/2x1-√2/2y1y2=x1sin45°+y1cos45°=√2/2x1+√2/2y1方程联立得：x1=√2/2（x2+y2...