直线l:
与直线m:
垂直,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
________ ,l交抛物线C:
的弦中点横坐标为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5dccb3a7493ef5514306dfd3ab136b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086610ebf9c6bafea8a0987073478bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
更新时间:2021-03-12 23:17:07
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