1 . 在平面直角坐标系
中,对于已知的点
,
,过点
分别作
轴和
轴的垂线
,
,记点
到直线
的距离为
,点
到直线
的距离为
,若
,则点
到点
的“特征距离”为
,若
,则点
到点
的“特征距离”为
.
(1)已知点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
①点
到点
的“特征距离”为______;
②点
在函数
的图象上,若点
到点
的“特征距离”为1,则点
的坐标为______;
(2)已知点
,点
,
为平面内的动点,其中
,
均为非负数,且满足
.以
为边作正方形
(
、
、
、
按顺时指针方向排列),记线段
上动点
到点
的“特征距离”为
,直接写出
的最大值和最小值,以及相应的
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd5c83e128a9f220131e706f88c8492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3a564d818475ea8fb19e4900114394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e1fa617863e37a37908aba227fce3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.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/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889a5e04c5187fb20415a59ce6adeed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a112216665de5f2730f20725fd1c97a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3acc3c421c4671b7031ceb6f1db3653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
您最近一年使用:0次
2021-09-02更新
|
241次组卷
|
3卷引用:北京市人民大学附属中学2021-2022学年上学期九年级开学考数学试题
名校
2 . 在平面直角坐标系
中,对于不在坐标轴上的点
,给出如下定义:取点
与点
,以
为直角边作等腰
,使
,且点C与点P在同一象限内,则称点C为点P的“对应点”,
为点P的“对应三角形”
(1)已知点P的“对应点”为点C,
①若点P的坐标为
,则点C的坐标为 ;
②若点C的坐标为
,则点P的坐标为 ;
(2)已知点
,过点P作x轴的垂线l,当直线l恰好将点Р的“对应三角形”的面积分成两个相等的部分时,求m,n满足的数量关系;
(3)已知点
,且满足
为定值,点C为点P的“对应点”,若
的最大值为2,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dd2c7c5c431d8776ba4fb7acc78c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4776e87dd96658bb5ffe1b09cb98c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)已知点P的“对应点”为点C,
①若点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0481d24e2af1e0cd348732b9444d1dde.png)
②若点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a3619ccbcf65312754a970647014e5.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8d2945996691d56235b1defc0b7cd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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名校
3 . 如图,在平面直角坐标系xOy中,半径为1的半圆O上有一动点B,点
,
为等腰直角三角形,A为直角顶点,且C在第一象限,则线段OC长度的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882080351584256/2894046853914624/STEM/25880ca0-6e54-4ed9-94b8-977ba0657427.png?resizew=441)
您最近一年使用:0次
2022-01-14更新
|
466次组卷
|
2卷引用:北京市第五中学分校2021-2022学年九年级上学期12月月考数学试题
4 . 在平面直角坐标系xOy中,点A(a,c)和点B(b,d).给出如下定义:以AB为边,作正方形ABCD,按照逆时针方向排列 A、B、C、D四个顶点,该正方形上的点到直线距离的最大值定义为:逆序正方形到直线的最大距离.
如图1,直线经过(0,3)且垂直于y轴,点A(﹣2,2),点B(﹣2,﹣1),可求得点C(1,﹣1),D(1,2),且逆序正方形ABCD到直线的最大距离为4.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901378040102912/2901896994136064/STEM/73238783-d41b-47fb-8db0-40c477175213.png?resizew=517)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901378040102912/2901896994136064/STEM/d08edfcf-d8c9-4551-90fc-bcc319b62a75.png?resizew=419)
(1)若点A(1,0),点B(3,﹣2),则点C的坐标为 ,点D的坐标为 ,逆序正方形ABCD到直线y=﹣x的最大距离为 .
(2)如图2,若点A(0,4),点B(3,0),求逆序正方形ABCD到直线y=x+2的最大距离.
(3)如果点A(a,1),B(a,﹣1),若存在逆序正方形ABCD到直线y=x的最大距离大于2
,直接写出a的取值范围.
如图1,直线经过(0,3)且垂直于y轴,点A(﹣2,2),点B(﹣2,﹣1),可求得点C(1,﹣1),D(1,2),且逆序正方形ABCD到直线的最大距离为4.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901378040102912/2901896994136064/STEM/73238783-d41b-47fb-8db0-40c477175213.png?resizew=517)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901378040102912/2901896994136064/STEM/d08edfcf-d8c9-4551-90fc-bcc319b62a75.png?resizew=419)
(1)若点A(1,0),点B(3,﹣2),则点C的坐标为 ,点D的坐标为 ,逆序正方形ABCD到直线y=﹣x的最大距离为 .
(2)如图2,若点A(0,4),点B(3,0),求逆序正方形ABCD到直线y=x+2的最大距离.
(3)如果点A(a,1),B(a,﹣1),若存在逆序正方形ABCD到直线y=x的最大距离大于2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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5 . 如图,在边长为
的正方形
各边上取点
,
,
,
(可与
,
,
,
重合),使得四边形
为正方形.设
为
,正方形
的面积为
.
(1)
关于
的函数表达式是________,自变量
的取值范围是________;
(2)在下面的平面直角坐标系
中,画出(1)中函数的图象;
(3)当
________
时,正方形
面积有最小值________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740004cfdade4c185f722dadc27e15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/1/65ce919d-8ed5-4359-862c-d6a1d05932f2.png?resizew=398)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在下面的平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
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6 . 已知:如图,
是边长为4的等边三角形,点D是射线
上的动点(不与点B,C重合),
是
的外角的平分线,以点A为顶点,
为一边,作
,
交射线
于点F,连接
.下列结论一定成立的是________ (只填序号).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/685f7b98-1bf1-440a-869c-770953a6048f.jpg?resizew=323)
点D在线段
上 点D在线段
的延长线上
①
; ②
是等边三角形;
③
; ④
的周长的最小值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5deb742445686d17a88e979c95dacca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/685f7b98-1bf1-440a-869c-770953a6048f.jpg?resizew=323)
点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3549b04dbd5525e8d838361ec1de959b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daeed0de2e2e2f521133abc8dad47d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb6f3d7540831a9e97d3b184a491.png)
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名校
7 . 在等腰Rt△ABC中,∠ACB=90°,D,E是边AC,BC上的点,且满足AD=CE,连接DE,过点C作DE的垂线,垂足为F,交AB于点G.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901487107809280/2901889129201664/STEM/edf5227a-a8a2-455e-a2c2-de278b883c37.png?resizew=239)
(1)点D如图所示.
①请依题意在下图中补全图形;
②猜想DE与CG的数量关系,并证明;
(2)连接DG,GE,若AB=2,直接写出四边形CDGE面积的最小值.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901487107809280/2901889129201664/STEM/edf5227a-a8a2-455e-a2c2-de278b883c37.png?resizew=239)
(1)点D如图所示.
①请依题意在下图中补全图形;
②猜想DE与CG的数量关系,并证明;
(2)连接DG,GE,若AB=2,直接写出四边形CDGE面积的最小值.
您最近一年使用:0次