如图,抛物线
经过
,
两点,与x轴交于另一点B,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/e7afb0b0-12c5-4ad0-96cd-d9d10a58bc46.png?resizew=154)
(1)求抛物线的解析式;
(2)平行于x轴的直线
与抛物线分别交于点D,E,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a6e338a7f2febaf9cec65a5f8a47d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc03fafb03395ed84030f03c5d93aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/e7afb0b0-12c5-4ad0-96cd-d9d10a58bc46.png?resizew=154)
(1)求抛物线的解析式;
(2)平行于x轴的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a739c202d9f8b174ef39cdfc25a50beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2022-11-28 12:49:30
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相似题推荐
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【推荐1】如图,在平面直角坐标系中,点A,B的坐标分别为
,经过A、B作y轴的垂线分别交于D、C两点,得到正方形
,抛物线
经过A,C两点,点P为抛物线上一点(不与点A重合),过点P分别作
轴交y轴于点F,
轴交x轴于点E,设点P的横坐标为m,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/27e9efbe-a5f5-4805-8aa1-d6e295e05e2f.png?resizew=203)
(1)求抛物线的解析式
(2)当抛物线在矩形
内部的部分y随x的增大而减小时,m的取值范围为_______.
(3)当P点在第一象限,矩形
与正方形
重叠部分图形的周长为
.
①若
时,函数
的最小值为
,求m的值;
②当
时,求
与m之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59352f1d2545360a2bce7d4c091aaeae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20008ade7e23b01f5abdee57fa05a63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213144e25996b7fd3cd69d9c5ae56be2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/27e9efbe-a5f5-4805-8aa1-d6e295e05e2f.png?resizew=203)
(1)求抛物线的解析式
(2)当抛物线在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fecc5cb4bd54139258f2796417377c.png)
(3)当P点在第一象限,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fecc5cb4bd54139258f2796417377c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66e8f13170da6a580c7bf76cc966d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c5188962ddff1aa8150245068e6caf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】如图,抛物线
经过
的三个顶点,点A、点B在
轴上,点
在
轴上,抛物线的对称轴交
轴于点
,过
点作
交对称轴于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/523c762d-5ab3-4bfa-9709-d27ad59fdfa7.png?resizew=164)
(1)求抛物线的函数表达式;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156185d70b4be6402951009de8680a2b.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11aba28f503a684a232490d37bcd3fd2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/523c762d-5ab3-4bfa-9709-d27ad59fdfa7.png?resizew=164)
(1)求抛物线的函数表达式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】已知关于x的一元二次方程(x﹣1)(x+2)=m+1(m为常数).
(1)若它的一个根是方程2(x+5)﹣4=0的根,则m的值为 ,方程的另一个根为 ;
(2)若它的一个根是关于x的方程2(x﹣m)+2=0的根,求m的值;
(3)若它的一个根是关于x的方程2(x﹣n)+2=0的根,设关于n的函数为y=m﹣n,请求出函数y的图象的顶点坐标.
(1)若它的一个根是方程2(x+5)﹣4=0的根,则m的值为 ,方程的另一个根为 ;
(2)若它的一个根是关于x的方程2(x﹣m)+2=0的根,求m的值;
(3)若它的一个根是关于x的方程2(x﹣n)+2=0的根,设关于n的函数为y=m﹣n,请求出函数y的图象的顶点坐标.
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解答题-证明题
|
适中
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【推荐2】已知二次函数
的图象与
轴分别交于A、
两点(点A在点
的左边),以
为直径作
,
与
轴正半轴交于
,点
为劣弧
上一动点,连接
、
两弦相交于点
,连接
,
.
(1)求点
的坐标;
(2)若
的半径为3时,求
的值;
(3)请探索当点
运动到什么位置时,使得
与
相似,并给予证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86667ae8cc7f37366f0c539cb189692.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)请探索当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
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【推荐1】已知抛物线y=ax2﹣ax﹣2a(a为常数且不等于0)与x轴的交点为A,B两点,且A点在B的右侧.
(1)当抛物线经过点(3,8),求a的值;
(2)求A、B两点的坐标;
(3)若抛物线的顶点为M,且点M到x轴的距离等于AB的3倍,求抛物线的解析式.
(1)当抛物线经过点(3,8),求a的值;
(2)求A、B两点的坐标;
(3)若抛物线的顶点为M,且点M到x轴的距离等于AB的3倍,求抛物线的解析式.
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【推荐2】请阅读下列材料,并完成相应的任务:
定义:我们把自变量为
的二次函数
与
(
,
)称为一对“亲密函数”,如
的“亲密函数”是
.
任务:
(1)写出二次函数
的“亲密函数”:______;
(2)二次函数
的图像与
轴交点的横坐标为1和
,它的“亲密函数”的图像与
轴交点的横坐标为______,猜想二次函数
(
)的图像与
轴交点的横坐标与其“亲密函数”的图像与
轴交点的横坐标之间的关系是______;
(3)二次函数
的图像与
轴交点的横坐标为1和
,请利用(2)中的结论直接写出二次函数
的图像与
轴交点的横坐标.
定义:我们把自变量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc670cb1a89da60c17b648b490a537c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03b011f69dfc5262a3d82f64676739b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b66caa95c7f8b4081b7df535b7d1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779396e366473c47c6aa431d0bb3b237.png)
任务:
(1)写出二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c8ccae07769aab6fe049f87407d08a.png)
(2)二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c8ccae07769aab6fe049f87407d08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630bb948780be53bc73d9ddef875000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26bd71b8c789bf2ab476dc51a8ce28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c05fd9626a4177436aac7cffcafb361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1863c6a91fe9a9e81b2297313ea3c063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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