已知二次函数
的图像经过点
,
,且当
,
时,
.
(1)求b的值;
(2)若
,
也是该二次函数图像上的两个点,且
,求实数m的取值范围;
(3)若点
不在该二次函数的图像上,求c的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de10eb4cf291d00db3bb92596143afa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a59cd5fd173b90b1cc5b31d7aecf9138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1292c47f62023b747f1a4bd615c75284.png)
(1)求b的值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825179f8315db4eee0b711bf5981bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05cedc2ab3c6241b7b8f55023a7daed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd5768040128978fcb22bda2a50a5af.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42b6747b2ac9b593c060d14f723c3616.png)
更新时间:2023-01-08 17:35:37
|
相似题推荐
解答题-问答题
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(0.4)
【推荐1】如图(1)所示,在平面直角坐标系中,平行于
轴的直线与抛物线
相交于
,
两点.设点
的横坐标为
.
(1)求
的长(用含
的代数式表示);
(2)如图(2)所示,点
在直线
上,点
的横坐标为
.若
,
,求顶点在
轴上且经过
,
两点的抛物线的顶点坐标;
(3)点
在直线
上,
,过
,
,
三点的抛物线的顶点为
,其对应函数的二次项系数为
.
①求
的值;
②当
,
为等腰直角三角形时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45848d377cad2507fe6846d0882005e7.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93a232c88870d213a7b74a796a1ff4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/1/b330175a-863e-4c97-b25e-c35a265b07d9.png?resizew=355)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)如图(2)所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525cef76ab5396af0846205d665388bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7388b08c76358b2800036424dfbf7ac.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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真题
【推荐2】小刚在用描点法画抛物线
:
时,列出了下面的表格:
(1)请根据表格中的信息,写出抛物线
的一条性质: ;
(2)求抛物线
的解析式;
(3)将抛物线
先向下平移3个单位长度,再向左平移4个单位长度,得到新的抛物线
;
①若直线
与两抛物线
,
共有两个公共点,求
的取值范围;
②抛物线
的顶点为A,与
轴交点为点
,
(点
在点
左侧),点
(不与点A重合)在第二象限内,且为
上任意一点,过点
作
轴,垂足为
,直线
交
轴于点
,连接
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![]() | ![]() | 0 | 1 | 2 | 3 | 4 | ![]() |
![]() | ![]() | 3 | 6 | 7 | 6 | 3 | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
①若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490be8d0cdb7bc6c39d1a37f3bc335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
②抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77dac8d9185105be114a0f1ffc594f0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960914419384320/2961018405920768/STEM/138cefe0-8a40-4f66-a4a2-3afbc783b73a.png?resizew=580)
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解题方法
【推荐1】抛物线y=ax2﹣4ax+3a(a>0)交x轴正半轴于A,B两点(A在B的左边),交y轴正半轴于C;
①求抛物线的解析式;
②抛物线上是否存在点P(不与B重合),使∠PCB+∠ACB≤45°,若存在,求出P点横坐标的取值范围,若不存在,请说明理由;
(2)如图②,若Q为B点右侧抛物线上的动点,直线QA、QB分别交y轴于点D,E,判断
的值是否为定值.请说明理由.
①求抛物线的解析式;
②抛物线上是否存在点P(不与B重合),使∠PCB+∠ACB≤45°,若存在,求出P点横坐标的取值范围,若不存在,请说明理由;
(2)如图②,若Q为B点右侧抛物线上的动点,直线QA、QB分别交y轴于点D,E,判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3379307e2b2711aed0d628857045983.png)
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名校
【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于点
(点
在点
的左侧),与
轴交于点
,其对称轴为直线
.
(2)如图
,已知点
为第三象限抛物线上一点,连接
,若
,求点
的坐标;
(3)
和点
分别是直线
和抛物线上的动点,且点
的横坐标比点
的横坐标大
个单位长度,分别过
作坐标轴的平行线,得到矩形
.设该抛物线在矩形
内部(包括边界)的图象的最高点与最低点的纵坐标的差为
.
如图
,当
时,请直接写出
的值;
请直接写出
关于
的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187544b669f8157a910233da3f5c5d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d58aabf178e41b21e3982b4e53e4d0.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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ad58997b9dc0b341c9af08f0cd1fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99393efa04579f3db5cf4f7e319f0440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99393efa04579f3db5cf4f7e319f0440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54078c4af5b305e26b8e3faa6423e67e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】规定:我们把直线l:
叫做抛物线L:
的“温暖直线”.若该直线与该抛物线还有两个不同的交点,则两个交点叫做“幸福点”,并且称直线l与抛物线L具备“温暖而幸福关系”,否则称直线l与抛物线L不具备“温暖而幸福关系”.
(1)已知直线l:
是抛物线L:
的“温暖直线”,请判断直线l与抛物线L是否具备“温暖而幸福关系”,若具备,请求出“幸福点”的坐标,若不具备,请说明理由;
(2)已知直线l:
与抛物线L:
不具备“温暖而幸福关系”,当
时,抛物线L:
的最小值是﹣6,求直线l的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1312a924a39744f83106794a78246d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e6fb48b8c2041afd008ca913d3e75.png)
(1)已知直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8364216ece44481be1b27065c27470ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53530199899712eb4ef9424d243315f.png)
(2)已知直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1312a924a39744f83106794a78246d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e6fb48b8c2041afd008ca913d3e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966d9dd819cba29980da3700422c2497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e6fb48b8c2041afd008ca913d3e75.png)
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【推荐1】新定义:我们把抛物线
与抛物线
其中
称为“关联抛物线”.例如:抛物线
的“关联抛物线”为
.已知抛物线
的“关联抛物线”为
.
(1)写出抛物线
的函数表达式(用含
的式子表示)
,顶点坐标为 .
(2)对于
和
,当
时,求
的取值范围.
(3)若
,当
时,
的最大值与最小值的差为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1452c779cfa8460894302bafe568b4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd6c18ed99f5982570290b81499df85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aec6362e0d8025b8e0dc633b2af31a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d856fd87bbe3768b8dfa015a11ba7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0f89833e92a986c12d0900f1f61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(1)写出抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b54e384a072508d4754e0f1636f8f66.png)
(2)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcd57980aa69fa7138fa5ac2478f64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e89b6eca35e34c863e832a2c661db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知二次函数
的图象经过点
.
(1)求二次函数的函数表达式;
(2)当
时,
①若
求
的取值范围;
②设直线AB 的函数表达式为
求m的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db191c7a8c2d3b53a944e48907a3b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1588fb05a9c887968e8e120dcbd7e0d.png)
(1)求二次函数的函数表达式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afd9e226c9e45f674286910bc495e0d.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ded4f0d008ed36b3e4a93c252be0b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3517d34caa168950ba847d8b43df57ec.png)
②设直线AB 的函数表达式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9685676692f50ab2d318bc32240c8652.png)
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解答题-问答题
|
较难
(0.4)
【推荐3】对于某一函数给出如下定义:如果存在实数p,当其自变量的值为p时,其函数值等于p,则称p为这个函数的不动值,在函数存在不动值时,该函数的最大不动值与最小不动值之差q称为这个函数的不动长度,特别地,当函数只有一个不动值时,其不动长度q为0,例如,下图中的函数有0和1两个不动值,其不动长度q为1.
(1)下列函数①y=2x,②y=x2+1,③y=x2﹣2x中存在不动值的是 (填序号)
(2)函数y=3x2+bx,
①若其不动长度为0,则b的值为 ;
②若﹣2≤b≤2,求其不动长度q的取值范围;
(3)记函数y=x2﹣4x(x≥t)的图象为G1,将G1沿x=t翻折后得到的函数图象记为G2,函数G的图象由G1和G2两部分组成,若其不动长度q满足0≤q≤5,则t的取值范围为 .
(1)下列函数①y=2x,②y=x2+1,③y=x2﹣2x中存在不动值的是 (填序号)
(2)函数y=3x2+bx,
①若其不动长度为0,则b的值为 ;
②若﹣2≤b≤2,求其不动长度q的取值范围;
(3)记函数y=x2﹣4x(x≥t)的图象为G1,将G1沿x=t翻折后得到的函数图象记为G2,函数G的图象由G1和G2两部分组成,若其不动长度q满足0≤q≤5,则t的取值范围为 .
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845231205990400/2846335424733184/STEM/d5d9dc0929cf435cafc2e485b0541b2b.png?resizew=224)
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