先阅读材料,再解答问题:
已知点
和直线
,则点P到直线
的距离d可用公式
计算.例如:求点
到直线
的距离.
解:由直线
可知:
.
所以点
到直线
的距离为
.
求:(1)求点P(2,-1)到直线y=x+1的距离.
(2)已知直线
与
平行,求这两条平行线之间的距离;
(3)如图已知直线
分别交
轴于
两点,☉C是以
为圆心,
为半径的圆,
为☉C上的动点,试求
面积的最大值.
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e4272971c3b8841d2605514034d802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fa1b9af129b9518bba8439e4e7f654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3178e2296170fb2ba5ed2c016a1edc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
解:由直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d480d7eace6c538a4919449b8ccdfeb4.png)
所以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3178e2296170fb2ba5ed2c016a1edc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555dd31301f0ae6fb09ce252177a0929.png)
求:(1)求点P(2,-1)到直线y=x+1的距离.
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab03b1642f1ea187c94f62088ac0fd.png)
(3)如图已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a4cdc721d1351682c594abb0bc3258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/647c97da671781944dcbac93af7cadcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2646018788147200/2651330355003392/STEM/a25d9f6d-c187-4d3d-9228-d2af30df8218.png)
更新时间:2021-02-05 08:08:19
|
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在平面直角坐标系中,直线
与
轴、
轴分别交于点
,
,点
的坐标为
,过点
作
于点
,点
为
轴正半轴上的一动点,且满足
,连接
,以
,
为边作平行四边形
,如果平行四边形
为正方形,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2832f82fdeafa819c92ca5c1e74eb5ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-证明题
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适中
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【推荐2】在平面直角坐标系中,现将一块等腰直角三角板ABC放在第一象限,斜靠在两条坐标轴上,且点A(0,3),点C(1,0),BE⊥
轴于点E,一次函数
经过点B,交y轴于点D.
(1)求证△AOC≌△CEB;
(2)求B点坐标;
(3)求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753842832ac2068a7823621fd3cdf52f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
(1)求证△AOC≌△CEB;
(2)求B点坐标;
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753842832ac2068a7823621fd3cdf52f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/765d9be3-1c16-4d05-af92-e989341b1b52.png?resizew=173)
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解答题-问答题
|
适中
(0.65)
【推荐1】对于平面直角坐标系
中的图形M,N,给出如下定义:P为图形M上任意一点,Q为图形N上任意一点,如果P,Q两点的距离有最小值,那么称这个最小值为图形M,N间的“最小距离”,记作
.
已知点
,
,连接
.
______;
(2)
的半径是r,若
,直接写出r的取值范围;
(3)
的半径是r,若将点B绕点A顺时针旋转
,得到点C.
①当
时
,求此时r的值;
②对于取定的r值,若存在两个不同的
值使得
,直接写出r的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f513553d63e9c87a70dd6aa57f97b1.png)
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efda59b83f0b3ecd509f09948bbc09c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e88d726b4b2e4b54667da2b5851672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6040198b33f39084ffea52b8d04f09.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865a8e068031c52e25710fe0b539e510.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd72af1df8e4719e71a866fffeff96.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe67394ed1a4ce45299d1f4c75108d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab29ec06f7f7b522ae81ff62e7cc9aa.png)
②对于取定的r值,若存在两个不同的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab29ec06f7f7b522ae81ff62e7cc9aa.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
为正比例函数
图象上的一个动点,
的半径为
,设点
的坐标为
.
与直线
相切时点
的坐标.
(2)请直接写出
与直线
相交、相离时
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02430f83e4f662e788d234da3c56ce2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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