2px

y²=2px上两点A，B和原点O连线，斜率OA+斜率OB为定值则AB过定点

y²=2px上两点A，B和原点O连线，斜率OA+斜率OB为定值则AB过定点

ob oa 2px 2025-01-11 23:22 18

y²=2px上两点A，B和原点O连线，斜率OA×斜率OB为定值则AB过定点

y²=2px上两点A，B和原点O连线，斜率OA×斜率OB为定值则AB过定点

ob oa 2px 2025-01-11 23:26 14