过抛物线
的焦点
的直线交抛物线于不同的两点
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ad7c068b9b7c0fd764cf7746407079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b816b76d0bd579fbaac5980801a7d07.png)
A.2 | B.1 | C.![]() | D.4 |
更新时间:2019-02-04 17:44:36
|
相似题推荐
单选题
|
较难
(0.4)
名校
【推荐1】如图,过抛物线
的焦点
的直线
与抛物线交于
,
两点,与抛物线准线交于
点,若
是
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
![](https://img.xkw.com/dksih/QBM/2019/4/18/2184982437142528/2190071313072128/STEM/1c492be1a8cd43e48db38c39d0a9bc8c.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
![](https://img.xkw.com/dksih/QBM/2019/4/18/2184982437142528/2190071313072128/STEM/1c492be1a8cd43e48db38c39d0a9bc8c.png?resizew=141)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐2】如图在正方体ABCD-A1B1C1D1中,P是上底面A1B1C1D1内一动点,PM垂直AD于M,PM=PB,则点P的轨迹为
![](https://img.xkw.com/dksih/QBM/2017/4/14/1665420736135168/1665671460757504/STEM/97193e5c-b358-4a7e-9a88-872ef8ffbb41.png)
![](https://img.xkw.com/dksih/QBM/2017/4/14/1665420736135168/1665671460757504/STEM/97193e5c-b358-4a7e-9a88-872ef8ffbb41.png)
A.线段 | B.椭圆一部分 |
C.抛物线一部分 | D.双曲线一部分 |
您最近一年使用:0次
【推荐1】已知抛物线
上三点
,直线
是圆
的两条切线,则
的面积最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/309b6323be80b349b6771802b461d263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d28bc5dbfa6e0ae1a62876fc3d0dedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.12 |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
解题方法
【推荐2】已知点
在抛物线
上,过点
作直线
,与抛物线分别交于不同于点
的
两点.若直线
的斜率互为相反数,则直线
的斜率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530e5817131adf2c05b99ff18eb9060f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() | B.![]() |
C.![]() | D.不存在 |
您最近一年使用:0次