已知点M到直线
的距离比它到点
的距离大1.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699102622728192/2700925730922496/STEM/bd454228-a76f-4a7f-9544-b13c684cd040.png?resizew=254)
(1)求点M的轨迹T的方程.
(2)过点
作抛物线的两条切线
,切点分别为A,B.另一直线l过点P与曲线T相交于两点C,D,与直线
相交于点Q.问
是否为定值?若是,求出定值;若不是,求其最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd24f3c4bc9f9a75d4b28630bb630d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5421a28dc3675ae20190d6090793246e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2699102622728192/2700925730922496/STEM/bd454228-a76f-4a7f-9544-b13c684cd040.png?resizew=254)
(1)求点M的轨迹T的方程.
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879080beb1e55cae2639645cd64c4710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508c9b1e8507167681dce92d67a15548.png)
20-21高二下·浙江·阶段练习 查看更多[2]
更新时间:2021-04-16 09:50:22
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【推荐1】已知平面上动点
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距离比它到直线
距离少1.
(1)求动点
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(2)记动点
的轨迹为曲线
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是否为定值?若为定值,请求出定值,若不为定值,请说明理由.
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(1)求动点
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(2)记动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】已知动圆P与x轴相切且与圆x2+(y-2)2=4相外切,圆心P在x轴的上方,P点的轨迹为曲线C.
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(2)已知E(4,2),过点(0,4)作直线交曲线C于A,B两点,分别以A,B为切点作曲线C的切线相交于D,当△ABE的面积S1与△ABD的面积S2之比
取最大值时,求直线AB的方程.
(1)求C的方程;
(2)已知E(4,2),过点(0,4)作直线交曲线C于A,B两点,分别以A,B为切点作曲线C的切线相交于D,当△ABE的面积S1与△ABD的面积S2之比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐1】在直角坐标系
中,直线
与抛物线
相交于
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两点.
(1)证明:
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(2)若点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8041c797b98b834c70dbf7d1d4346.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658aa70a197c830aa765f2f7ea4c86c5.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab2c5c85301cf851418b1f57402d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76999794f6a77f36b1cbf2ac074919db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01030e61eb4534faaa2a448946076ed2.png)
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【推荐2】已知直线
经过抛物线
的焦点且与此抛物线交于
两点,
,直线
与抛物线
交于
两点,且
两点在
轴的两侧.
(1)证明:
为定值;
(2)求直线
的斜率的取值范围;
(3)已知函数
在
处取得最小值
,求线段
的中点
到点
的距离的最小值(用
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008d0107d9a5539043c29ba8179f1168.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
(3)已知函数
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