在平面直角坐标系中,已知点A(0,2).B(2,2),抛物线
与直线x=﹣2交于点P.
(1)用含m的代数式表示抛物线的对称轴及顶点坐标;
(2)设点P的纵坐标为
,求
的最小值;此时抛物线上有两点
,且
.比较
与
的大小;
(3)当抛物线与线段AB有公共点时,请求出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5632e0525ecbd97c7ab84ebad9d1dabd.png)
(1)用含m的代数式表示抛物线的对称轴及顶点坐标;
(2)设点P的纵坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6cfbe589feebb9e804d167667e4645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6cfbe589feebb9e804d167667e4645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c30b0a927297b165300bc32acf177d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ccd6af0638c4377a1bf3c08ac649c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)当抛物线与线段AB有公共点时,请求出m的取值范围.
更新时间:2022-09-09 09:45:25
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【推荐1】定义:在平面直角坐标系
中,当点
在图形
的内部,或在图形
上,且点
的横坐标和纵坐标相等时,则称点
为图形
的“梦之点”.
的顶点坐标分别是
,
,
,
,在点
,
,
中,是矩形ABCD“梦之点”的是______;
(2)如图②,已知点A,B是抛物线
上的“梦之点”,点C是抛物线的顶点.连接
,判断
的形状并说明理由.
(3)在(2)的条件下,点P为抛物线上一点,点Q为平面内一点,是否存在点P、Q,使得以
为对角线,以A、B、P、Q为顶点的四边形是菱形?若存在,求出P点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629647152cb83bddff554480a6b48f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9cea8a373f9bd983d9f051f70d5c61d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6413a5a82f8e62f7b2ae723d110a5cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9cf766c2def1e7248c08c23606ad2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841838440ee6230ea2d4e6c1b6cd6985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d02e558af8e085e424c0a3ba350cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86513f7f06e8624a9710c6e09094dd1.png)
(2)如图②,已知点A,B是抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effd04464cfb154a5b3862c80289e710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5aeeb9eaac7b451a89bfd337883acaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在(2)的条件下,点P为抛物线上一点,点Q为平面内一点,是否存在点P、Q,使得以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】已知抛物线:
:
经过点在
,
,与y轴的交点为C.关于原点对称的抛物线为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/09c849b1-ffab-46c0-bdf4-3240554c8f70.png?resizew=305)
(1)求抛物线
的函数表达式;
(2)点A在
的对应点为M,若点P是抛物线
上一点,过点P作x轴的垂线,垂足为Q,若
相似,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/09c849b1-ffab-46c0-bdf4-3240554c8f70.png?resizew=305)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
(2)点A在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4a145c9eca8c0fa021d2019b3a4382.png)
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【推荐1】如图,一次函数
与反比例函数
的图像交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/bac1f9cd-5142-4996-a4df-86897d964dee.png?resizew=168)
(1)求反比例函数的解析式;
(2)直接写出不等式
的解集;
(3)设一次函数
与y轴相交于点M,C为一次函数上一点,作
∥
与反比例函数
交于点D,连接
,若点D的纵坐标为
,求三角形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373e940578737a54a51be72e53a31c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9999e85ca29691eb07c2cdd55fc25500.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/bac1f9cd-5142-4996-a4df-86897d964dee.png?resizew=168)
(1)求反比例函数的解析式;
(2)直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c577427f881ac5335d323fb06c945e16.png)
(3)设一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373e940578737a54a51be72e53a31c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc97b3d966e2a95e19d006a9de713ee.png)
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【推荐2】已知抛物线
是常数,
,自变量
与函数值
的部分对应值如下表:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3bac4a2f-07d5-436e-be17-8a70cc570cfa.png?resizew=233)
(1)根据以上信息,可知抛物线开口向______,对称轴为直线______.
(2)求抛物线的解析式和
的值.
(3)将抛物线
的图象记为
,将
绕点
旋转
后的图象记为
合起来得到的图象记为
,完成以下问题:
①若直线
与函数
有且只有两个交点,直接写出
的取值范围.
②若对于函数
上的两点
,当
时,总有
,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04702f417fc63d6c899bd9b1c1a3fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28b08682efa2692b052f64fe1448fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
0 | 1 | 2 | 3 | … | |
1 | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3bac4a2f-07d5-436e-be17-8a70cc570cfa.png?resizew=233)
(1)根据以上信息,可知抛物线开口向______,对称轴为直线______.
(2)求抛物线的解析式和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31481f1d288bc96c83434c863a1d9140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee12926fd31aa5a5f86a97c259e4b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead6a3dbd03539ef5e0807be57bb1e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
②若对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6f381a23847d87c5a9d414f3ad3e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdfe3ba6d55132bb468fcab9c2b74a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐3】小明投资销售一种进价为每件15元的护眼台灯.销售过程中发现,每月销售量y(件)与销售单价x(元)之间的关系可近似的看作一次函数:
,在销售过程中销售单价不低于成本价,而每件的利润不高于成本价的60%.
(1)设小明每月获得利润为w(元),求每月获得利润w(元)与销售单价x(元)之间的函数关系式,并求出自变量x的取值范围.
(2)当销售单价定为多少元时,每月可获得最大利润?每月的最大利润是多少?
(3)如果小明想要每月获得的利润不低于1500元,那么小明每月的成本最少需要多少元?(成本=进价×销售量)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fecb8ac0e13383b894188eac36239244.png)
(1)设小明每月获得利润为w(元),求每月获得利润w(元)与销售单价x(元)之间的函数关系式,并求出自变量x的取值范围.
(2)当销售单价定为多少元时,每月可获得最大利润?每月的最大利润是多少?
(3)如果小明想要每月获得的利润不低于1500元,那么小明每月的成本最少需要多少元?(成本=进价×销售量)
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【推荐1】在平面直角坐标系
中,抛物线
与y轴交于点A,将点A向左平移2个单位长度,得到点B,点B在抛物线上.
(1)抛物线的对称轴是直线
__________;
(2)若
,
为抛物线上两点,满足
,
,当
时,判定
与
的大小关系,并说明理由;
(3)已知点D的横坐标为1,且点D在直线
上,点C的坐标为
,若抛物线与线段
恰有一个公共点,请结合函数图象,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e3c2cd8cb3a36bf7d051c6f9c7287b.png)
(1)抛物线的对称轴是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311a36f03fac6d979014e605e80913a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d046826b3840b908d823d90be499e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cd9af362cd03aca8cc82a6c8491492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)已知点D的横坐标为1,且点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42d9c17cd93553eae0a043bca0ee651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db1116f04fc87dd82be7ebf8deb573d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】在平面直角坐标系xOy中,点(m – 2, y1),(m, y2),(2- m, y3)在抛物线y = x2-2ax + 1上,其中m≠1且m≠2.
(1)直接写出该抛物线的对称轴的表达式(用含a的式子表示);
(2)当m = 0时,若y1= y3,比较y1与y2的大小关系,并说明理由;
(3)若存在大于1的实数m,使y1>y2>y3,求a的取值范围.
(1)直接写出该抛物线的对称轴的表达式(用含a的式子表示);
(2)当m = 0时,若y1= y3,比较y1与y2的大小关系,并说明理由;
(3)若存在大于1的实数m,使y1>y2>y3,求a的取值范围.
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