已知动直线l与圆
相交于A,B两点,且满足
,点C为直线l上一点,若M是线段AB的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfeaa669e2f1c4f97f233879e335a890.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a64bcb77f5f64e4af6930c249a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfeaa669e2f1c4f97f233879e335a890.png)
更新时间:2020-05-05 23:38:11
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