1:1  11-09[数学]李老师教你判断点与圆的位置关系
推荐理由：巧用一元二次方程根的判别式判断点与圆的位置关系 讲解人：http://www.jiandan100.cn/teacher/fae98fe4b5174cffa7590eb901b0e3c0/ ， 北京一零一中学数学教师，多次参加中考阅卷。 题面：已知⊙O的半径为1，点P与O的距离为R，且方程  有实数根，则P在⊙O的_______________.
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