已知直线
交y轴于点A,交x轴于点B,二次函数的图象过
、
两点,交x轴于另一点C,
,且对于该二次函数图象上的任意两点
,
,当
时,总有
.
(1)求二次函数的表达式;
(2)直线
与抛物线交于M、N两点,求
面积的最小值;
(3)E为线段
上不与端点重合的点,直线
过点C且交直线
于点F,求
与
面积之和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965e22408d166eb72b197aeffd80bee6.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/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b225d772013d021cf1bfe7b9421fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b7e35faab6d74fa0c36599c39d1698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588cffd5a8bfd2646d11ba2dc877a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
(1)求二次函数的表达式;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5246f402ea79d83bd76b0dc4d3f0829e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0154169c1d46d4364a87bf190cf85a44.png)
(3)E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81ebb6f69d090e9ca3cc75008a00451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
2023·广东广州·二模 查看更多[2]
更新时间:2023-05-30 23:24:27
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解答题-问答题
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【推荐1】如图,抛物线y=x2﹣mx﹣(m+1)与x轴负半轴交于点A(x1,0),与x轴正半轴交于点B(x2,0)(OA<OB),与y轴交于点C,且满足x12+x22﹣x1x2=13.
(1)求抛物线的解析式;
(2)以点B为直角顶点,BC为直角边作Rt△BCD,CD交抛物线于第四象限的点E,若EC=ED,求点E的坐标;
(3)在抛物线上是否存在点Q,使得S△ACQ=2S△AOC?若存在,求出点Q的坐标;若不存在,说明理由.
(1)求抛物线的解析式;
(2)以点B为直角顶点,BC为直角边作Rt△BCD,CD交抛物线于第四象限的点E,若EC=ED,求点E的坐标;
(3)在抛物线上是否存在点Q,使得S△ACQ=2S△AOC?若存在,求出点Q的坐标;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156685205528576/2161597509304320/STEM/6d8f74f420544f0ba64f73ff94b88382.png?resizew=163)
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解答题-作图题
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【推荐1】用绘图软件绘制抛物线m:
与动直线l:
相交于两点,图1为
时的视窗情形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/16315b63-9b8f-4bd0-9a21-6565b6d7c627.png?resizew=465)
(1)求图1中A,B两交点之间的距离.
(2)如图2,将图1中的直线l绕点B旋转得到
,且
经过抛物线m与x轴的交点C,M为抛物线
段上一动点,过点M作
轴与
交于点N,求
的最大值.
(3)视窗的大小不变,但其可视范围可以变化,且变化前后原点O始终在视窗中心(例如:将图1中坐标系的单位长度变为原来的2倍,如图3,其可视范围就由
及
变成了
及
).若l与m的交点分别是点P和
,为能看到抛物线m在点P,Q之间的一整段图象,需要将图1中坐标系的单位长度至少变为原来的k倍,求整数k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f57c5d08e534712f29c041ee91478d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46111e4d12c21798aa213c0d7804c2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/16315b63-9b8f-4bd0-9a21-6565b6d7c627.png?resizew=465)
(1)求图1中A,B两交点之间的距离.
(2)如图2,将图1中的直线l绕点B旋转得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20f734ac54ab0eec2e1c170a3a24f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)视窗的大小不变,但其可视范围可以变化,且变化前后原点O始终在视窗中心(例如:将图1中坐标系的单位长度变为原来的2倍,如图3,其可视范围就由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fafbd9bf133aa40650a0f4da1076235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a6d3006fa4e9147a33e12b5d295fda.png)
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【推荐2】直线y=-3x+3与x轴、y轴分别交于A、B两点,点A关于直线x=-1的对称点为点C.
(1)求点C的坐标;
(2)若抛物线
(m≠0)经过A、B、C三点,求抛物线的表达式;
(3)若抛物线
(a≠0)经过A,B两点,且顶点在第二象限.抛物线与线段AC有两个公共点,求a的取值范围.
(1)求点C的坐标;
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef114fa9f0ad2c4f8796ad81b65e7f.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/904d061a-1bcc-4594-bfe7-f5587cca45c2.png?resizew=165)
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解答题-证明题
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名校
【推荐1】如图1,将三角板放在正方形
上,使三角板的直角顶点E与正方形
的顶点A重合三角板的一边交
于点F.另一边交
的延长线于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/e760b2fa-9e5b-4b36-8054-d3bd7abc726d.png?resizew=523)
(1)求证:
;
(2)如图2,移动三角板,使顶点E始终在正方形
的对角线
上,其他条件不变,(1)中的结论是否仍然成立?若成立,请给子证明;若不成立.请说明理由;
(3)如图3,将(3)中的“正方形
”改为“矩形
”,且使三角版的一边经过点B,其他条件不变,若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/e760b2fa-9e5b-4b36-8054-d3bd7abc726d.png?resizew=523)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
(2)如图2,移动三角板,使顶点E始终在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图3,将(3)中的“正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232e6f5e7b978ee341cb75283fbd328e.png)
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解答题-证明题
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【推荐2】在
中,
,
分别是
,
的中点,延长
至点
,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/01a24750-a1e4-45e9-b649-342920145ebc.png?resizew=130)
(1)求证:四边形
是平行四边形.
(2)
于点
,连接
,若
是
的中点,
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/01a24750-a1e4-45e9-b649-342920145ebc.png?resizew=130)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0972f8dc1e2a5720ea7bc57dfd9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341a26c0df01855efb6fd69a9929fc36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f960e26e4a05a221809651d13046395.png)
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【推荐1】如图,已知直角梯形OABC的边OA在y轴的正半轴上,OC在x轴的正半轴上,OA=AB=2,OC=3,过点B作BD⊥BC,交OA于点D.将∠DBC绕点B按顺时针方向旋转,角的两边分别交y轴的正半轴、x轴的正半轴于E和F.
(1)求经过A、B、C三点的抛物线的解析式;
(2)当BE经过(1)中抛物线的顶点时,求CF的长;
(3)连接EF,设△BEF与△BFC的面积之差为S,问:当CF为何值时S最小,并求出这个最小值.
(1)求经过A、B、C三点的抛物线的解析式;
(2)当BE经过(1)中抛物线的顶点时,求CF的长;
(3)连接EF,设△BEF与△BFC的面积之差为S,问:当CF为何值时S最小,并求出这个最小值.
![](https://img.xkw.com/dksih/QBM/2018/12/23/2102996994342912/2104494301437952/STEM/3d50d97ec1e74aa2840e02b226ecf874.png?resizew=148)
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【推荐2】已知二次函数
的图象与
轴交于点C,过点C作CD∥
轴交该函数的图象于点D,过点D作DE∥
轴交
轴于点E,已知点F(1,0),连接DF.
(1)请求出该函数图象的顶点坐标(用含
的代数式表示);
(2)如图,若该二次函数的图象的顶点落在
轴上,P为对称轴右侧抛物线上一点;
①连接PD、PE、PF,若
,求点P的坐标;
②若∠PFD=
∠DEF,点P的横坐标为m,则m的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5f7504c3a337f6d0273ef3fd39936c.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)请求出该函数图象的顶点坐标(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)如图,若该二次函数的图象的顶点落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①连接PD、PE、PF,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678141ac2504b8b7a4ac070ebcf06bc9.png)
②若∠PFD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/42c75e12-f374-42f8-ab9c-1e8eb4c52150.png?resizew=201)
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解题方法
【推荐3】如图,抛物线y=ax2+bx+c经过点A(5,0),B(-3,0),C(0,4),过C作CD∥x轴交抛物线于D,连结BC、AD,两个动点P、Q分别从A、B两点同时出发,都以每秒1个单位长度的速度运动,其中,点P沿着线段AB向B点运动,点Q沿着折线B→C→D的路线向D点运动,设这个两个动点运动的时间为t(秒)(0<t<7),△PQB的面积记为S.
(1)求这条抛物线的函数关系式;
(2)求S与t的函数关系式;
(3)当t为何值时,S有最大值,最大值是多少?
(4)是否存在这样的t值,使得△PQB是直角三角形?若存在,请直接写出t的值;若不存在,请说明理由.
(1)求这条抛物线的函数关系式;
(2)求S与t的函数关系式;
(3)当t为何值时,S有最大值,最大值是多少?
(4)是否存在这样的t值,使得△PQB是直角三角形?若存在,请直接写出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/42a5fc24-c3f6-4d20-96f7-f6b7bc64285e.png?resizew=176)
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