已知抛物找
(a、b为常数,且
),顶点为A,与y轴交于点B,点B、C关于抛物线的对称轴对称,连接AB、BC、AC,点
.
(1)当
,
时,求顶点A的坐标;
(2)当
时,点A在x轴下方时,求b的取值范围;
(3)当△ABC的面积为4,求a的值:
(4)点D关于抛物线对称轴的对称点是E,直线AE交BC于F,且直线AE将△ABC的面积分成1:3的两部分,且△BEF的面积为
,直接写出a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8048cbb2ad56fff65fc1946ca5b6e898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d776a89f4fd29dccffe1040069d59ee.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(3)当△ABC的面积为4,求a的值:
(4)点D关于抛物线对称轴的对称点是E,直线AE交BC于F,且直线AE将△ABC的面积分成1:3的两部分,且△BEF的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
2022·吉林长春·模拟预测 查看更多[2]
2022年吉林省长春吉大附中力旺实验中学中考模拟数学试题(已下线)专题22.12 二次函数y=ax2+bx+c(a≠0)的图象与性质(分层练习)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)
更新时间:2022-05-25 17:31:53
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相似题推荐
解答题-问答题
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解题方法
【推荐1】如图,在平面直角坐标系中,抛物线y=x2+bx+c与x轴交于点A和点B(1,0),与y轴交于点C(0,﹣3).
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930307840114688/2938214688890880/STEM/282c2a05-0445-4cd4-aad9-c7ff0789127f.png?resizew=381)
(1)求抛物线的函数表达式.
(2)若点P为第三象限内抛物线上一动点,作PD⊥x轴于点D,交AC于点E,过点E作AC的垂线与抛物线的对称轴和y轴分别交于点F、G,设点P的横坐标为m.
①求PE+
EG的最大值;
②连接DF、DG,若∠FDG=45°,求m的值.
![](https://img.xkw.com/dksih/QBM/2022/3/6/2930307840114688/2938214688890880/STEM/282c2a05-0445-4cd4-aad9-c7ff0789127f.png?resizew=381)
(1)求抛物线的函数表达式.
(2)若点P为第三象限内抛物线上一动点,作PD⊥x轴于点D,交AC于点E,过点E作AC的垂线与抛物线的对称轴和y轴分别交于点F、G,设点P的横坐标为m.
①求PE+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
②连接DF、DG,若∠FDG=45°,求m的值.
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【推荐2】平面直角坐标系
中,二次函数
的图象与
轴交于点
和
,交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/c3cffe1c-2dec-429f-8c8d-1155ae5ff757.png?resizew=133)
(1)求二次函数的对称轴和
点坐标;
(2)将点
向右平移
个单位,再次落在二次函数图象上,求
的值;
(3)对于这个二次函数,若自变量
的值增加3时,对应的函数值
增大,求满足题意的自变量
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](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/b57f5353818d0e41d51657a7d9655021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76da640bd19d2c87ad041fd44666de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/c3cffe1c-2dec-429f-8c8d-1155ae5ff757.png?resizew=133)
(1)求二次函数的对称轴和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)对于这个二次函数,若自变量
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】已知抛物线
.
(1)抛物线的顶点坐标为 ;
(2)当
时,
的最大值为
,求出
的值;
(3)在(2)的条件下,若
,
是抛物线上两点,其中
,记抛物线在
、
之间的部分为图像
包含
、
两点
,当
、
两点在抛物线的对称轴的两侧时,图像
上最高点与最低点的纵坐标之差为
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe269951d5f2b289a752e34d07973838.png)
(1)抛物线的顶点坐标为 ;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a12a30935c79ae769818043a496f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae31cb73af20f08e4a5f7c123a4a1339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/959b61f7c1af929cc4ff7d39338edca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.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/5caa79888fd132575c6b5fdb26c84b93.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/04582116cd765fcc5a52f44279ad6c94.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,抛物线
与
轴交于
、
两点,抛物线的顶点为
,对称轴为直线
,
交
轴于点
.
(1)求点
、
、
的坐标;
(2)点
是抛物线上的动点,过点
作
轴于点
,点
在
轴上,且点
在点
上方,是否存在这样的点
、
,使得以点
、
、
为顶点的三角形与
全等,若存在,请求出点
、
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd2a4fd3bb67a779bb3eb86d9830283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/00a122d4-ef4e-46ff-ab96-ed92b904e95e.png?resizew=183)
(1)求点
![](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)
(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/e19a722a1564ff4cecc6e1b5a6c59096.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/d053b14c8588eee2acbbe44fc37a6886.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐1】如图,在平面直角坐标系中,点O为坐标原点,抛物线
交x轴于A、B两点,交y轴于点C,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/e007f16c-5349-481b-b73b-14742d0ad764.png?resizew=844)
(1)求抛物线的解析式;
(2)点D为第一象限抛物线上一点,连接
、
,设点D的横坐标为t,
的面积为S,求S与t之间的函数关系式;(不要求写出自变量t的取值范围)
(3)在(2)的条件下,连接
,过点D作
轴,垂足为点E,延长
至点F,连接
,使得
,连接
、
,
交x轴于点G,点M为y轴负半轴上一点,连接
,若
,且
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102068e41a208a7ba4fc87a125d08ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/e007f16c-5349-481b-b73b-14742d0ad764.png?resizew=844)
(1)求抛物线的解析式;
(2)点D为第一象限抛物线上一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1caea6e1bca3ef6f86542c03f076c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea6ba9552c3dadf0ef73629e520ccd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15d9541b5cb50f7e75b66c509683402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】在平面直角坐标系中,О为原点,
顶点
,
,点C是线段
上一动点(点C不与点O,B重合),过C作
交
于点D,将
沿
翻折,使点B落在x轴的点E处.
(2)设
,
与
重叠部分的面积为S.
①如图②,当重叠部分为四边形时,试用含t的式子表示S,并直接写出t的取值范围;
②当
时,求t的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786080c82db1e1d3ec6367397aa63220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60d188df4133c78bcc45a809f3009cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
①如图②,当重叠部分为四边形时,试用含t的式子表示S,并直接写出t的取值范围;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887d7a2e6a7753af6e6cb88921d634ec.png)
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