如图,在平面直角坐标系
中,已知一次函数
的图象与反比例函数
的图象交于点
,
两点.
(1)求一次函数的表达式及点
的坐标;
(2)点
是第四象限内反比例函数图象上一点,过点
作
轴的平行线,交直线
于点
,连接
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b343d77ee4dced82ecc479206c42977d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5294ca04521fa5de92d5ae032d7c54a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbb60b7db5b47598f7a203607d5b747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)求一次函数的表达式及点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8564af587904bfed1196b122b6bb1582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/6/15/2485190760079360/2492152012120064/STEM/1565899d-d1a1-49e6-b9ca-282e1b553b2e.png)
更新时间:2020-06-25 10:39:09
|
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解答题-问答题
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名校
【推荐1】下面是一位同学的数学学习笔记,请仔细阅读并完成任务.
任务:
(1)若
,则当
_____时,代数式
取最小值,最小值为______;
(2)已知若
,函数
,试说明当
取何值时,
取得最小值,并求出
的最小值;
(3)如图,已知点
是反比例函数
图象上一动点,点
,则
的面积的最小值为______.
用均值不等式求最值 |
若实数![]() ![]() ![]() ![]() |
证明:![]() |
![]() |
![]() |
![]() |
![]() |
由上可知,①当![]() ![]() |
②当![]() ![]() |
所以,利用均值不等式可以求一些函数的最值. |
例:已知![]() ![]() |
解:![]() |
![]() |
![]() ![]() ![]() |
![]() ![]() ![]() |
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27461ab853362602617f3b2dcf4001f.png)
(2)已知若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92ebbe4e0164e6e4a4733e9286d1e37.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/d053b14c8588eee2acbbe44fc37a6886.png)
(3)如图,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90890fb829fc21fc1d827aecec597fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7941eefc4e262e5144d8dfe74f58fc5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
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【推荐2】如图,菱形ABCD放置在平面直角坐标系中,已知点A(﹣3,0),B(2,0),点D在y轴正半轴上,反比例函数的图象经过点C.
(1)求反比例函数的表达式.
(2)将菱形ABCD向上平移,使点B恰好落在双曲线上,此时A,B,C,D的对应点分别为A′,B′,C′,D′,且C′D′与双曲线交于点E,求点E的坐标.
(1)求反比例函数的表达式.
(2)将菱形ABCD向上平移,使点B恰好落在双曲线上,此时A,B,C,D的对应点分别为A′,B′,C′,D′,且C′D′与双曲线交于点E,求点E的坐标.
![](https://img.xkw.com/dksih/QBM/2020/8/12/2526416692248576/2526747101913088/STEM/dc7542f452b2464c9dcb6deb3085f9fb.png?resizew=158)
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【推荐1】如图,在平面直角坐标系中,点
在反比例函数
上的图像上,将点
先向右平移1个单位长度,再向下平移
个单位长度后得到
,点
恰好落在反比例函数
的图像上.
(2)联结
并延长,交反比例函数的图像于点
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3956b653921dff43c77ce15f89e6944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
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【推荐2】如图所示,直线
与坐标轴交于
、
两点,在
轴上取点
使得
,过点
作
交直线
于点
,反比例函数
与直线
交于点
,已知
.
(1)求反比例函数的解析式;
(2)用无刻度直尺和圆规作线段
的垂直平分线(不写作法,保留作图痕迹);
(3)判断点
是否在垂直平分线上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7090adf670566a2d7ce5903924d72f.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb0cb135b77b10612f470c5035dabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93278327416d0474606954788bdd2f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d49d34012ddf68fb981eb4975ac99b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3971055dc0d3b227472e95d726f9b45b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/828bd6eb-416f-44c1-a8fd-e54e2ec5b518.png?resizew=199)
(1)求反比例函数的解析式;
(2)用无刻度直尺和圆规作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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