类比学习是知识内化的有效途径,认真读题是正确审题的第一步:对于平面直角坐标系xOy中的点P(a,b),若点
的坐标为
(其中k为常数,且k≠0),则称点
为点P的“k系好友点”;例如:P(1,2)的“3系好友点”为
即
.请完成下列各题:
(1)点P(-3,1)的“2系好友点”
的坐标为______.
(2)若点P在y轴的正半轴上,点P的“k系好友点”为
点,若在三角形
中,
,求k的值.
(3)已知点A(x,y)在第四象限,且满足xy=-8;点A是点B(m,n)的“-2系好友点”,求m-2n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fbc1587fb05556185a464289b853762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf0a9ae232a21285122c291da581e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a594acd075649e89c8e1bbc6296a1bd.png)
(1)点P(-3,1)的“2系好友点”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
(2)若点P在y轴的正半轴上,点P的“k系好友点”为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c40be83ff0784c6df49155e7acac193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6a2cd00301bf1818014ec7bee7c8bc.png)
(3)已知点A(x,y)在第四象限,且满足xy=-8;点A是点B(m,n)的“-2系好友点”,求m-2n的值.
更新时间:2022-08-25 17:08:31
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【推荐1】(1)如果|x|=2,则x= ;
(2)如果x=﹣x,则x= ;
(3)如果|x|=x,求x的取值范围;
(4)如果|x|=﹣x,求x的取值范围.
(2)如果x=﹣x,则x= ;
(3)如果|x|=x,求x的取值范围;
(4)如果|x|=﹣x,求x的取值范围.
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【推荐2】读一读:
数形结合作为一种数学思想方法,其应用大致又可分为两种情形:或者借助于数的精确性来阐明形的某些属性,或者借助形的几何直观性来阐明数之间某种关系,即数形结合包括两个方面:第一种情形是“以数解形”,而第二种情形是“以形助数”.例如:在我们学习数轴的时候,数轴上任意两点,
表示的数为
,
表示的数为
,则
,
两点的距离可用式子
表示,例如:5和-2的距离可用
或
表示.
研一研:
如图,在平面直角坐标系中,直线
分别与
轴正半轴、
轴正半轴交于点
、点
,且
、
满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/e36d02c5-6307-460c-86c1-947db229348d.png?resizew=439)
(1)直接写出以下点的坐标:
(______,0),
(0,______).
(2)若点
、点
分别是
轴正半轴(不与
点重合)、
轴负半轴上的动点,过
作
,连接
.已知
(近似值),请探索
与
之间的数量关系,并说明理由.
(3)已知点
是线段
的中点,若点
为
轴上一点,且
,求点
的坐标.
数形结合作为一种数学思想方法,其应用大致又可分为两种情形:或者借助于数的精确性来阐明形的某些属性,或者借助形的几何直观性来阐明数之间某种关系,即数形结合包括两个方面:第一种情形是“以数解形”,而第二种情形是“以形助数”.例如:在我们学习数轴的时候,数轴上任意两点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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/a13880b9454c5942f164d934b1834783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7ba690de4bdbdceb968265181a208f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9642893060f4633b2394557fd1b61e72.png)
研一研:
如图,在平面直角坐标系中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c09615735d331befd07664aa47cb8a.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/053b1b12ec44d44cef04920f455aaa40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/e36d02c5-6307-460c-86c1-947db229348d.png?resizew=439)
(1)直接写出以下点的坐标:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc962e84c6d80f0471732c3bef2fe68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a68f5e1bc8ed3db2caa77acbe51fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2225e9d4e443d81abfe1bed83ba25e9b.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0913e0c22ce025eea9a56d5c0b860063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc71bbc6fbca7f7deb0538ed6ea057a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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解答题-作图题
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【推荐3】问题:探究函数y=|x|-1的性质.
小凡同学根据学习函数的经验,对函数y=|x|-1的图象与性质进行了探究.下面是小凡的探究过程,请补充完整:
(1)在函数y=|x|-1中,自变量x的取值范围是______________;
(2)下表是y与x的几组对应值.
①m=_________;
②若A(n,9),B(10,9)为该函数图象上不同的两点,则_n=__________;
(3)如下图,在平面直角坐标系xOy中,描出以上表中各对对应值为坐标的点.并根据描出的点,画出该函数的图象;
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461197613178880/2461945334054912/STEM/12319deac48541e8b23ee5c7a02419b3.png?resizew=190)
(4)结合函数图象,解决问题:
①函数的最小值为________;
②已知直线
与函数
的图象交于C,D两点,当y1≥y时x的取值范围是___________.
小凡同学根据学习函数的经验,对函数y=|x|-1的图象与性质进行了探究.下面是小凡的探究过程,请补充完整:
(1)在函数y=|x|-1中,自变量x的取值范围是______________;
(2)下表是y与x的几组对应值.
x | -3 | -2 | -1 | 0 | 1 | 2 | 3 | ||
y | 2 | 1 | 0 | -1 | 0 | 1 | m |
①m=_________;
②若A(n,9),B(10,9)为该函数图象上不同的两点,则_n=__________;
(3)如下图,在平面直角坐标系xOy中,描出以上表中各对对应值为坐标的点.并根据描出的点,画出该函数的图象;
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461197613178880/2461945334054912/STEM/12319deac48541e8b23ee5c7a02419b3.png?resizew=190)
(4)结合函数图象,解决问题:
①函数的最小值为________;
②已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2d13032b3f5a70c30fb4f0bf205969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c0a01e5c041437100c944bc111a1d3.png)
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【推荐1】求下列各式中x的值.
(1)4 (x-1) 2 =25
(2)
(x+2) 2 =7
(1)4 (x-1) 2 =25
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819d9c174a4c2d7c4c5b30b62f0a5d8.png)
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名校
【推荐2】计算下列各题:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56397e1e757eb0980b4368f00cc14385.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f94de14562ad98c6efc42cf34b907d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604cb5d165ca9486cf6297786dba3f69.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c38f8ff3afcbc67831199d33172597.png)
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名校
【推荐1】如图,在平面直角坐标系中,直线 l 经过点A(一2,3),B(4,0),交y轴于点C
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/942de313-0aee-4e1a-a60e-fcb92c74c4b9.png?resizew=281)
(1)求直线 l 的函数表达式;
(2)若D为x轴上一动点,当△ACD的面积为1时,试求出点D的坐标;
(3)若将CB绕着点C旋转90°得到CP,试求出点P的坐标
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/942de313-0aee-4e1a-a60e-fcb92c74c4b9.png?resizew=281)
(1)求直线 l 的函数表达式;
(2)若D为x轴上一动点,当△ACD的面积为1时,试求出点D的坐标;
(3)若将CB绕着点C旋转90°得到CP,试求出点P的坐标
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解答题-作图题
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【推荐2】如图,在平面直角坐标系中,每个小正方形的边长均为
,点
的坐标为
,点
的坐标为
,点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/ab9db2b8-9f48-45e7-a622-93129c385d41.png?resizew=248)
(1)作出
关于
轴对称的
;
其中
,
,
分别是
,
,
的对应点,不写画法
.
(2)直接写出
,
,
三点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dc0e7c221cb7577bb2ba9b0a5644ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddd46c180401ad4e86b9ef4d5883721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2234eabaa7f119a3624e6370fb82c1eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/ab9db2b8-9f48-45e7-a622-93129c385d41.png?resizew=248)
(1)作出
![](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/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.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/04582116cd765fcc5a52f44279ad6c94.png)
(2)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bde9258da29e3517635b1c7ef239edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
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