解题方法
1 . 在平面直角坐标系
中,直线
过抛物线
的焦点F,且与抛物线C交于A,B两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef574d774836e5d756626eae8349603.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea05a2396e436b4df62d6328dbeaddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef574d774836e5d756626eae8349603.png)
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解题方法
2 . 已知圆
的圆心到抛物线
的准线的距离为4,过圆心且倾斜角为
的直线
与抛物线
的交点为M, N,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098658ddd8826dc6637297e1e6c7acdc.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0432c56030419038ec5423b987874651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098658ddd8826dc6637297e1e6c7acdc.png)
您最近一年使用:0次
名校
解题方法
3 . 已知抛物线
,其焦点为
,准线为l,过F的直线交抛物线于A,B两点,连接AO(O为原点)交l于C,连接BO交l于D,则四边形ABCD面积的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
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解题方法
4 . 已知抛物线
的焦点为
,点F关于直线
的对称点为M,过点F的直线l与抛物线C交于P,Q两点,当
时,直线PQ的斜率为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf92a1ba410263d4f68b7e0432b19aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae33e127007e3c1a8d1228e4fc83913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a34b6cc0075d4aaae12982543091dcb.png)
您最近一年使用:0次