设抛物线
与x轴的交点分别为A、B(点A在点B的左侧),顶点为C.若a、b、c满足
,则称该抛物线为“正定抛物线”;若a、b、c满足
,则称该抛物线为“负定抛物线”.特别地,若某抛物线既是“正定抛物线”又是“负定抛物线”,则称该抛物线为“对称抛物线”.
(1)“正定抛物线”必经过x轴上的定点______;“负定抛物线”必经过x轴上的定点______.
(2)若抛物线
是“对称抛物线”,且经过
,求此抛物线对应的函数表达式.
(3)若抛物线
是“正定抛物线”,当
或p时,该抛物线顶点分别为
,
,若
轴,求n与p之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c766352f0be38b719621052de92615bd.png)
(1)“正定抛物线”必经过x轴上的定点______;“负定抛物线”必经过x轴上的定点______.
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8198a82c8ea2e0c53d04af22fa9a8fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a084ec8ffefff0a3a71515febea4e3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21103c7dfa3e2e915c01e41f463f4328.png)
更新时间:2024-05-23 11:51:14
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【推荐1】如图,抛物线y=ax2+bx+c经过A(﹣
,0),B(3
,0),C(0,3)三点,线段BC与抛物线的对称轴l交于点D,该抛物线的顶点为P,连接PA,AD,线段AD与y轴相交于点E.
(1)求该抛物线的表达式和点P的坐标;
(2)在y轴上是否存在一点Q,使以Q,C,D为顶点的三角形与△ADP全等?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求该抛物线的表达式和点P的坐标;
(2)在y轴上是否存在一点Q,使以Q,C,D为顶点的三角形与△ADP全等?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698778709598208/2699934139113472/STEM/8b7180d9-1426-4916-b64e-fa9601032e97.png)
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【推荐2】二次函数
的图象交x轴于点A(-1,0),B(4,0),两点,交y轴于点C,动点M从点A出发,以每秒2个单位长度的速度沿AB方向运动,过点M作MN⊥x轴交直线BC于点N,交抛物线于点D,连接AC,设运动的时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2976482181611520/3043632612196352/STEM/c94f201561504179be5d1fa083b34066.png?resizew=279)
(1)求二次函数
的表达式;
(2)连接BD,当
时,求△DNB的面积;
(3)在直线MN上存在一点P,当△PBC是以∠BPC为直角的等腰直角三角形时,求此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/30/2976482181611520/3043632612196352/STEM/c94f201561504179be5d1fa083b34066.png?resizew=279)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
(2)连接BD,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209f628619c849207905b3d2bd3f07b2.png)
(3)在直线MN上存在一点P,当△PBC是以∠BPC为直角的等腰直角三角形时,求此时点P的坐标.
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【推荐1】如图1,抛物线
交
轴于
,
两点,与
轴交于点
,连接
,
.点
是第二象限内抛物线上的一个动点,点
的横坐标为
,过点
作
轴,垂足为
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967914629070848/2971685284487168/STEM/c75aa565-a15b-42b0-9cbc-baac0ae4bcae.png?resizew=413)
(1)求此抛物线的表达式;
(2)过点
作
,垂足为
,请用含
的代数式表示线段
的长,并求出当
为何值时
有最大值,最大值是多少?
(3)如图2,连接
,
,
,将线段
绕点
顺势针旋转
,
的对应点为
,连接
和
,若
面积与
面积比为3:2,求点
坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f4e5753572fa4b0b5bec168ebf593a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d6a83496abd272b7008d18de033986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967914629070848/2971685284487168/STEM/c75aa565-a15b-42b0-9cbc-baac0ae4bcae.png?resizew=413)
(1)求此抛物线的表达式;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9887e1ff61308713287d592c8e8d942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a630858806f18ca3aafd1ff1383531f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c733c8bb6ee8666dc5477d5fb8c6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b616aee5d389fd01da2003a51ef8f129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df979665ca12befa5edd11669d533715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
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【推荐2】已知二次函数
,
(
,
为常数,
).
(1)若
,求二次函数
的顶点坐标.
(2)若
,设函数
的对称轴为直线
,求
的值.
(3)点
在函数
图象上,点
在函数
图象上.若函数
图象的对称轴在
轴右侧,当
,
时,试比较
,
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ee5337ce3058a369d76a352e05bb7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9ab6114bbde7c85fdfd6472ce28441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4808e101eea810eed912c4da129f2c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48196cf98394fcbce4181c33754141dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891caed81d431eaaa90c3b95c26ada05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5461320542b1be88dc8a71b5ec680b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a41a0a2aac6586d91079bcbcd42041e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】已知抛物线
交
轴于
、
两点(点
在点
左侧),交
轴于点
,且当
时,
,点
是第一象限内抛物线上的一个动点.
(1)求
,
的值;
(2)①若
为整数,且
的值也为整数,直接写出满足条件的点
的坐标;
②若点
在该抛物线上,且
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415ce7008a89ffca8c3c3edbf13a935e.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/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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc65d6eb9b63f96d80b54ec9893aee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a417f68c6538bfb63e729c047755b4ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0529f6967e6d36703c2627b46d9097b0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0194863fe3bb19ece1b389af480ff02a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8193193a0c2ae1fbf708dbf0fb65a612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46b03f241208edaab2ed7a5be62abf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ce02a6dadb7d9eb1f96262ba11e766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aaff39079c196753d1d80419d0a8d5f.png)
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【推荐2】在平面直角坐标系中,函数
(m为常数)的图象记为G.
(1)当
时,图象G的最高点坐标为___________.
(2)当图象G与坐标轴只有两个交点时,求m的值.
(3)当
时,图象G的最高点到x轴的距离为1时,求m的值.
(4)当图象G上有四个点到直线
的距离等于到x轴距离的
时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c92e7d02b971f87573151ccf4623dc.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
(2)当图象G与坐标轴只有两个交点时,求m的值.
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2b74d89854116e411c089d053df053.png)
(4)当图象G上有四个点到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f33ac73294865557a251aa654ecd2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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