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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沙发#
发布于：2012-11-09 18:48
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____边缘上___________.
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板凳#
发布于：2012-11-10 20:45
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____边缘上___________.
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地板#
发布于：2012-11-10 21:19
P在⊙O的____边缘上___________.
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4楼#
发布于：2012-11-11 13:08
圆上或园内
:lo圆上或园内
l  |
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5楼#
发布于：2012-11-11 21:10
∵方程有实数根
∴△=b²-4ac≥0 ∴R≤1 ∴点P在圆上或……圆外？ |
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6楼#
发布于：2012-11-12 22:01
则P在⊙O的____边缘上___________.
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7楼#
发布于：2012-11-14 19:46
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____边缘上___________.
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