已知抛物线
,直线
,
与抛物线C分别交于A,B两点,过A,B两点分别作抛物线C的切线,两条切线交于点M.当
时,直线AB的斜率为1.
(1)求抛物线C的方程,并写出其准线方程;
(2)请探究
的面积是否为定值?若是,请求出该定值;若不是,请求出其最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf92a1ba410263d4f68b7e0432b19aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12cf143dab15476c761377e1aad1d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
(1)求抛物线C的方程,并写出其准线方程;
(2)请探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
21-22高三下·河北·阶段练习 查看更多[2]
更新时间:2022-04-30 10:19:04
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适中
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【推荐1】已知抛物线关于
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【推荐2】已知点F为抛物线
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(2)若点A在第一象限,且抛物线在点A处的切线交y轴于点M,求
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(1)求该抛物线的方程;
(2)若点A在第一象限,且抛物线在点A处的切线交y轴于点M,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef6516358878a47560b1d9eff2d5c09.png)
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【推荐1】已知点
,直线
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(1)若动点M到点F的距离比它到直线l的距离小1,试求点M的轨迹E的方程;
(2)过轨迹E上一点P作圆C的切线,切点为A,B,要使四边形PACB的面积S最小,求P点坐标及S的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
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(2)过轨迹E上一点P作圆C的切线,切点为A,B,要使四边形PACB的面积S最小,求P点坐标及S的最小值.
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名校
解题方法
【推荐2】已知动点
到定点
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.
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与直线
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的面积为
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的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092fd1b1d33979818300cd2e3699bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】设抛物线
的准线为l,A、B为抛物线上两动点,
于
,定点
使
有最小值
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/f32f8a5e-ab97-41a3-a59b-f0f7f66fbb26.png?resizew=155)
(1)求抛物线的方程;
(2)当
(
且
)时,是否存在一定点T满足
为定值?若存在,求出T的坐标和该定值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf39f807af4ea7bec39fe04b60566c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67f0ac21a3b9c3e7d11d1547217850b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be0ce029f4205563bf67a73d55a143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/f32f8a5e-ab97-41a3-a59b-f0f7f66fbb26.png?resizew=155)
(1)求抛物线的方程;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941dcd189840d67264beaa7f973b87e5.png)
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【推荐2】设抛物线
的焦点为
,
为直线
上的动点,过
作
的两条切线,切点分别为
.
(1)若
的坐标为
,求
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803dc3c76fd2b51696647aa18602412.png)
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(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c53329d203cb9a596b65cfc55f4a3.png)
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