过点
的直线l分别与圆
及抛物线
依次交于E,F,G,H四点,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bec55f638559c413950ce41bbda9afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dca2415dee662897b676734cfc768d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4fa76b5eb5ff3b9b9a78ea31a5569e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/63740069-7311-453a-9358-d3bd4331c6f8.png?resizew=157)
更新时间:2022-06-13 21:44:32
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适中
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解题方法
【推荐1】若直线
(
)经过圆
的圆心,则
的最小值是__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b73c964937c39f4e386e634f9ad3b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705d6d0a046281db9a588d76b4fc2199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
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【推荐2】已知两定点,
,如果动点
满足
,点
是圆
上的动点,则
的最大值为
您最近一年使用:0次
填空题-单空题
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解题方法
【推荐1】抛物线有如下光学性质:过焦点的光线经抛物线反射后得到的光线平行于抛物线的对称轴;反之,平行于抛物线对称轴的入射光线经抛物线反射后必过抛物线的焦点.已知抛物线
的焦点为
,一条平行于
轴的光线从点
射出,经过抛物线上的点
反射后,再经抛物线上的另一点
射出,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4665cc756635abc74f907e364d2f26e9.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afc9ec7583a7f47f2826c1297a88d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4665cc756635abc74f907e364d2f26e9.png)
您最近一年使用:0次
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【推荐2】斜率为1的直线
经过抛物线
的焦点
,且与该抛物线相交于
,
两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
您最近一年使用:0次