真题
名校
1 . 已知二次函数
(a>0)的图象与x轴交于A、B两点,(A在B左侧,且OA<OB),与y轴交于点C.
(1)求C点坐标,并判断b的正负性;
(2)设这个二次函数的图像的对称轴与直线AC交于点D,已知DC:CA=1:2,直线BD与y轴交于点E,连接BC,
①若△BCE的面积为8,求二次函数的解析式;
②若△BCD为锐角三角形,请直接写出OA的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
(1)求C点坐标,并判断b的正负性;
(2)设这个二次函数的图像的对称轴与直线AC交于点D,已知DC:CA=1:2,直线BD与y轴交于点E,连接BC,
①若△BCE的面积为8,求二次函数的解析式;
②若△BCD为锐角三角形,请直接写出OA的取值范围.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228262277554176/2229853309632512/STEM/19c3eed9222a47e3828043de3883d991.png?resizew=224)
您最近一年使用:0次
2019-06-20更新
|
1318次组卷
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7卷引用:2019年云南省临沧市四中中考数学模拟试卷(6月份)
名校
2 . 已知抛物线
与
轴交于
,
两点.
(2)如图1,M是抛物线顶点,点P在抛物线上,若直线
经过
外接圆的圆心,求点P的横坐标;
(3)如图2,点N是第一象限内抛物线上的一动点,连接
分别交
、y轴于D、E两点, 若
、
的面积分别为
,求
的最大值;
(4)点Q是抛物线对称轴上一动点,当
的值最大时,点Q的坐标为: .(直接填空)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
(2)如图1,M是抛物线顶点,点P在抛物线上,若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8045b729b7f257861057191a8a2388.png)
(3)如图2,点N是第一象限内抛物线上的一动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c023f4b501684abd869b36d6e6c7f21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f15efc7a9adc06b5064d605c391dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2578b9b66df3cb080f572564c87ad60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
(4)点Q是抛物线对称轴上一动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23014167657b0982a97200d4671d6c7.png)
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3 . 如图,抛物线
经过点
和点
,与y轴交于点C,顶点为D,连接
、
,
与抛物线的对称轴l交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/e78ad51a-d7f7-480c-bcd1-8dc74fb2a3ef.png?resizew=173)
(1)求该抛物线的函数表达式;
(2)点P是第一象限抛物线上的动点,连接
,
,当四边形
面积取最大值时,求点P的坐标;
(3)点N是对称轴l右侧抛物线上的动点,在射线ED上是否存在点M,使得以M,N,E为顶点的三角形与
相似?若存在,直接写出点M的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/e78ad51a-d7f7-480c-bcd1-8dc74fb2a3ef.png?resizew=173)
(1)求该抛物线的函数表达式;
(2)点P是第一象限抛物线上的动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f7c674f87a67fde99afceb3cfd8189.png)
(3)点N是对称轴l右侧抛物线上的动点,在射线ED上是否存在点M,使得以M,N,E为顶点的三角形与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
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2023-03-10更新
|
195次组卷
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5卷引用:2021年云南省腾冲市初中学业水平模拟考试数学试题
2021年云南省腾冲市初中学业水平模拟考试数学试题山东省枣庄市滕州市2021-2022学年九年级上学期期末数学试题广东省河源市碧桂园学校2022-2023年九年级数学上学期期末数学试卷(已下线)2023年广东省佛山市中考一模数学试卷变式题21-23题(已下线)猜想02二次函数综合题(6种常见题型专练)-2023-2024学年九年级数学上学期期末考点大串讲(人教版)
4 . 已知:如图直线
与抛物线
交于A、B两点,C是抛物线顶点.
![](https://img.xkw.com/dksih/QBM/2023/9/1/3315379669327872/3332287082610688/STEM/54c8ce6fe9944f749954fa07b2697c59.png?resizew=209)
(1)求A、B、C点的坐标;
(2)求
的面积;
(3)直接写出
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c6530fa1662b3306667c465d41bfdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c28b4f0234b698f001e7dec787b4d44.png)
![](https://img.xkw.com/dksih/QBM/2023/9/1/3315379669327872/3332287082610688/STEM/54c8ce6fe9944f749954fa07b2697c59.png?resizew=209)
(1)求A、B、C点的坐标;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956d9cbaec14a1e238585147480f75e5.png)
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5 . 如图,抛物线
与
轴交于
,
两点(点
在点
的左侧),且点
为
,与
轴交于点
,直线
经过
,
两点,点
是第一象限内抛物线上的一个动点,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/bb938574-14c2-449c-b83b-6a0a849f5108.png?resizew=182)
(1)求抛物线的函数表达式;
(2)直线
的解析式记为
,当
时,直接写出
的取值范围;
(3)设点
的横坐标为
,四边形
的面积为
,求
的最大值并求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442834866daf52da017a459b05d8031b.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/bb938574-14c2-449c-b83b-6a0a849f5108.png?resizew=182)
(1)求抛物线的函数表达式;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed06ccefffc165f9c77250cd28301d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cccd1f9e838f8065f004ac14377b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f7c674f87a67fde99afceb3cfd8189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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6 . 综合与探究
如图,在平面直角坐标系中,抛物线
与y轴交于点
,与x轴交于点
,连接
.
(2)P是
下方抛物线上的一动点,过点P作x轴的平行线交
于点C,过点P作
轴于点D.
①求
的最大值;
②连接
,是否存在点P,使得线段
把
的面积分成
两部分?若存在,请直接写出点P的坐标;若不存在,请说明理由.
如图,在平面直角坐标系中,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e31372ebc93ef965b22d01594e06abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e71e5556367a7ded46fcdcaf2eee5bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1484ddc948caf40e4c3243bc959584.png)
您最近一年使用:0次
2024-01-30更新
|
265次组卷
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4卷引用:2024年云南省昭通市巧家县大寨中学九年级中考考前适应性评估数学模拟预测题
7 . 如图,抛物线y=x2+bx+c经过A(-1,0)、B(4,5)两点,点E是线段AB上一动点,过点E作x轴的垂线,交抛物线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/f7a47ce1-ca5d-47a4-81c3-3d026aa99617.png?resizew=167)
(1)求抛物线的解析式;
(2)求线段EF的最大值;
(3)抛物线与x轴的另一个交点为点C,在抛物线上,x轴上方是否存在一个动点P,使得S△ACP=
S△ABC?若存在,求出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/f7a47ce1-ca5d-47a4-81c3-3d026aa99617.png?resizew=167)
(1)求抛物线的解析式;
(2)求线段EF的最大值;
(3)抛物线与x轴的另一个交点为点C,在抛物线上,x轴上方是否存在一个动点P,使得S△ACP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
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2022-07-19更新
|
380次组卷
|
2卷引用:云南省昆明市四川师范大学附属昆明实验学校安宁校区2021-2022学年九年级上学期期中数学试题
8 . 如图1,抛物线
与x轴交于点
、
,与y轴交于点C,点P为x轴上方抛物线上的动点,点F为y轴上的动点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/275f9fa2-59de-4ace-8dd5-ccaac650c8a1.png?resizew=368)
(1)求该抛物线所对应的函数解析式;
(2)如图1,当点F的坐标为
,过点P作x轴的垂线,交线段
于点D,求线段
长度的最大值;
(3)如图2,是否存在点F,使得
是以点A为直角顶点的等腰直角三角形?若存在,求出点F的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ea7c4ecb7e3d312a42e1e3dac9935e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa0adc80b0fa252227d395a4b9a0da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/275f9fa2-59de-4ace-8dd5-ccaac650c8a1.png?resizew=368)
(1)求该抛物线所对应的函数解析式;
(2)如图1,当点F的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300fd8f113765fa786ff1f7c9bd7fd88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)如图2,是否存在点F,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4995e05e462dedee1852dc80ffe17cc7.png)
您最近一年使用:0次
2024-01-11更新
|
174次组卷
|
3卷引用:云南省昆明市西山区昆明金岸中学2023-2024学年九年级上学期期中数学试题
9 . 如图,抛物线
经过
、
两点,点
是线段
上一动点,过点
作
轴的垂线,交抛物线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/aab843fe-354f-40be-803b-e028ec8724c6.png?resizew=146)
(1)求抛物线的解析式;
(2)求线段
的最大值;
(3)抛物线与
轴的另一个交点为点
,在抛物线上是否存在一个动点
,使得
?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527adf33876b600568772d6ff0a91310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9de7b55463b5a3f9b64c0d74d68938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/aab843fe-354f-40be-803b-e028ec8724c6.png?resizew=146)
(1)求抛物线的解析式;
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)抛物线与
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bbcbdadfb48a113547aff724ea8908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2022-07-10更新
|
374次组卷
|
2卷引用:云南省大理白族自治州剑川县马登镇初级中学2021-2022学年九年级上学期期中数学试题
10 . 如图,在平面直角坐标系中,抛物线
经过点
并与x轴交于A,B两点,且点A的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/85eb8681-3cc5-4e3d-b5c4-d380a985c32d.png?resizew=157)
(1)求抛物线的解析式;
(2)若抛物线与y轴交于点C,顶点为点P,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6964fa7e48ab583ced1365dd4e00cea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/85eb8681-3cc5-4e3d-b5c4-d380a985c32d.png?resizew=157)
(1)求抛物线的解析式;
(2)若抛物线与y轴交于点C,顶点为点P,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31039dbbbcad3eaa3c85a3ddfeca2b3e.png)
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