已知:点
与点
关于原点对称.
(1)分别求a,b的值;
(2)求点A关于x轴的对称点的坐标;
(3)求点B关于y轴的对称点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c18f830191c727c302f80390e235f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce7be37ff9418a9c95d5dc54814ebd9.png)
(1)分别求a,b的值;
(2)求点A关于x轴的对称点的坐标;
(3)求点B关于y轴的对称点的坐标.
22-23九年级上·青海西宁·期中 查看更多[3]
青海省西宁市新华联北外附属外国语初级中学2022-2023学年九年级上学期期中数学试题(已下线)专题4.3 中心对称-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(浙教版)(已下线)第02讲 中心对称-【帮课堂】2023-2024学年九年级数学上册同步学与练(人教版)
更新时间:2023-02-06 10:08:50
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【推荐1】如图,在如图所示的平面直角坐标系中,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931832526151680/2936786301444096/STEM/8c7a241e-56c3-4ee1-8a55-d071fa9d9640.png?resizew=204)
(1)作
关于
轴对称的
;
(2)写出
关于
轴对称的
的顶点
、
、
的坐标;
(3)
的面积
__________;
(4)请在
轴上找一点
,使得
最小,只需在图上标出点
的位置,无需求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c21dde2ad1e31c337bfb78c810ccb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5593ca86a1f7ad0cbcc801c3cb77f285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e61dd6cbb403ec51f5af91bd0e351b6.png)
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931832526151680/2936786301444096/STEM/8c7a241e-56c3-4ee1-8a55-d071fa9d9640.png?resizew=204)
(1)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(2)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(4)请在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-作图题
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【推荐2】在平面直角坐标系中,
的位置如图所示,已知点A的坐标是
.
(1)点C关于y轴对称的点的坐标( , );
(2)将三角形
向右平移2个单位,得到它的像为
,请在图中画出
的图形;
(3)
的面积 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d03268e486f9fb09a44eca7d8ff7a9b.png)
(1)点C关于y轴对称的点的坐标( , );
(2)将三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884e4bec1a5258d57d8084893d6989bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884e4bec1a5258d57d8084893d6989bb.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/9/20/2554093905387520/2554837772779520/STEM/249df14a-63e9-435d-a401-1533a51851e2.png)
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【推荐1】当
为何值时,(1)点A(2,3m)关于原点的对称点在第三象限;
(2)点B(3m-1,0.5m+2)到
轴的距离等于它到
轴距离的一半?
![](https://img.xkw.com/dksih/QBM/2014/3/12/1573712907321344/1573712913555456/STEM/8df288962ae14b8dab5b6731371c742a.png)
(2)点B(3m-1,0.5m+2)到
![](https://img.xkw.com/dksih/QBM/2014/3/12/1573712907321344/1573712913555456/STEM/2a7b109944f64b31af1c7bd3e3e74d80.png)
![](https://img.xkw.com/dksih/QBM/2014/3/12/1573712907321344/1573712913555456/STEM/3a728fe27fcb483cb827c2186060056d.png)
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【推荐2】我们不妨约定,若某函数图象上至少存在不同的两点关于原点对称,则把该函数称之为“H函数”,其图象上关于原点对称的两点叫做一对“H点”.根据该约定,完成下列各题.
(1)在下列关于x的函数中,是“H函数”的,请在相应题目后面的括号中画“✓”,不是“H函数”的画“✕”.
①
( );
②
( );
③
( );
④
( ).
(2)若A(1,m)与B(n,-4)是关于x的“H函数”的一对“H点”,求mn的值.
(1)在下列关于x的函数中,是“H函数”的,请在相应题目后面的括号中画“✓”,不是“H函数”的画“✕”.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a9b769d70cb6f29e965c800921c8ea.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e212cdbfba6610bc55df2c1a737407.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef854dfcbba9b7dedc1bc52f6332b011.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8684443809254c64330bb349b473bda5.png)
(2)若A(1,m)与B(n,-4)是关于x的“H函数”的一对“H点”,求mn的值.
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