已知顶点在原点
的抛物线
,
,过抛物线焦点
的动直线
交抛物线于
、
两点,当直线
垂直于
轴时,
面积为8.下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b35f0b940c8422ef47edc3b7ce55e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75de1947893e5c7a4d98d4458398fd6e.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
A.抛物线方程为![]() |
B.若![]() ![]() ![]() |
C.![]() |
D.![]() |
更新时间:2023-02-22 08:58:03
|
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解题方法
【推荐1】已知x,y是正数,且
,下列叙述正确的是( )
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A.2xy最大值为![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() |
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适中
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【推荐2】一家货物公司计划租地建造仓库储存货物,经市场调查了解到下列信息:每月土地占地费
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为4万元,下列结论正确的是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
【推荐1】已知抛物线
:
,
为坐标原点,一束平行于
轴的光线
从点
射入,经过
上的点
反射后,再经
上的另一点
反射后,沿直线
射出,经过点
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8953ded144195804384dcb494d5e2a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f3f21f4a06c19ed07b41aeef336005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.![]() |
B.![]() |
C.![]() |
D.延长![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
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适中
(0.65)
解题方法
【推荐2】已知抛物线
的准线方程为
,过抛物线
的焦点
的直线
交抛物线
于
两点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1c84057882768f20a01365c81b6760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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A.![]() | B.设![]() ![]() |
C.以![]() ![]() | D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
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【推荐1】已知
,过抛物线
:
焦点
的直线与抛物线
交于
,
两点,
为
上任意一点,
为坐标原点,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e97cb3b7850a61b8012d5df016dfd9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.过![]() ![]() |
B.![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.抛物线![]() ![]() ![]() |
您最近一年使用:0次
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适中
(0.65)
名校
解题方法
【推荐2】已知抛物线
,直线l与抛物线C交于A,B两点,且
,O为坐标原点,且
,若直线l恒过点
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A.抛物线方程为![]() |
B.![]() |
C.![]() |
D.弦![]() |
您最近一年使用:0次