在平面直角坐标系
中,我们把函数图象上横坐标与纵坐标相等的点叫做这个图象上的“不动点”.已知抛物线
,记为
轴的两交点中的右侧交点为
.
(1)抛物线
的“不动点”的坐标为_______;
(2)平移抛物线
,使所得新抛物线的顶点是抛物线
的“不动点”,求新抛物线的解析式并说明具体的平移过程;
(3)平移抛物线
,使所得新抛物线的顶点
同时也是该新抛物线的“不动点”.若
是以
为腰的等腰三角形,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
(2)平移抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
(3)平移抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f8a33ab7b6d46fc6aa88c370e54983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f8a33ab7b6d46fc6aa88c370e54983.png)
更新时间:2021-02-08 06:49:36
|
相似题推荐
解答题-证明题
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【推荐1】如图,点B在线段
上,点D、E在
同侧,
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/2/16/3176146988834816/3177952000720896/STEM/83b631e237f64b93acfea30f6701253e.png?resizew=210)
(1)求证:
;
(2)若
,点P为线段
上的动点,连接
,作
,交直线
于点Q.若点P与A、B两点不重合,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e81b1b9606ad25244ff82c8292df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7754def2a1547a806957f3bc06c2097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://img.xkw.com/dksih/QBM/2023/2/16/3176146988834816/3177952000720896/STEM/83b631e237f64b93acfea30f6701253e.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd401dc4a9d069735d83e0b1f84715.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c04e331430dd3e46d542990f427c5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d173f0c46fa12f79bcc26fbd60aae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26977b87da3426d7af1d04cdee21cc5c.png)
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【推荐2】已知在平面直角坐标系
中,点
,
在反比例函数
的图象上.
的值;
(2)将反比例函数
的图象中
轴下方部分沿
轴翻折,其余部分保持不变,得到新的函数图象如图
所示,新函数记为函数
.
①如图
,直线
与函数
的图象交于
,
两点,点
横坐标为
,点
横坐标为
,且
,
,点
在
轴上,连接
,
.当
最小时.求点
的坐标;
②已知一次函数
的图象与函数
的图象有三个不同的交点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e3829bae3f056b86ef3ce85b3e5536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcc739fbbcfd1ae5d2085779fbadb87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)将反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2787d404327268c7405cf49041c88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b5720c89a43d6767a92c2f4d56aec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac656ec89607f52b5353dba400fab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②已知一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cc567b1bf919103e64147e5604fb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】如图①,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AB.直线y=-2x+8过点B交y轴于点C,点F是线段BC上一动点,过点F作
轴,交线段AB于点E,交抛物线于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/64572b71-d568-463f-892b-91ec94ae2f16.png?resizew=271)
(1)求抛物线的表达式;
(2)设点D的横坐标为m,当EF=5ED时,求m的值;
(3)若抛物线
上有一点H,且满足四边形ABFH为矩形.
①直接写出 此时线段BF的长;
②将矩形ABFH沿射线BC方向平移得到矩形
(点A、B、F、H的对应点分别为
、
、
、
),点K为平面内一点,当四边形
是平行四边形时,将抛物线
沿其对称轴上下平移得到新的抛物线
,若新的抛物线
同时经过点K和点
,直接写出 点K的横坐标 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25965c636b1ffb6065a2485be996e216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a23e87d16c32b5aa4357f481b5808a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e7ec9f3e17dbb0362a8c9aac629a15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/64572b71-d568-463f-892b-91ec94ae2f16.png?resizew=271)
(1)求抛物线的表达式;
(2)设点D的横坐标为m,当EF=5ED时,求m的值;
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25965c636b1ffb6065a2485be996e216.png)
①
②将矩形ABFH沿射线BC方向平移得到矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b598595d22cc2a8a0aadb4e60b1149d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86163e76653de1f383788b741fb64a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15149612947a6fb7fb83a5775690d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25965c636b1ffb6065a2485be996e216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86163e76653de1f383788b741fb64a8b.png)
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名校
【推荐2】综合与实践
【问题初探】数学小组先以抛物线
为例,对函数图象的平移变换做了以下研究:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0757ca2a03cb7611104a9a840e84fa7c.png)
(1)k的值为____________,若
在抛物线
上,则平移后对应的点为
坐标为____________;
【探究归纳】同学们对函数图象向左平移1个单位,解析式中的x反而变为
产生了疑惑,这与点的坐标平移规律不一样,从而展开深入研究,以下是他们的部分相关研究笔记:
定义:函数图象按
平移是指沿x轴方向向右
平移h个单位或向左
平移
个单位;再沿y轴向上
平移k个单位或向下
平移
个单位.
设抛物线为
上的任意一点为
,将抛物线按
平移后,M的对应点
,
(2)若反比例函数
按
平移,求平移后的函数解析式;
(3)若抛物线按
平移,规定平移路径长为
.将抛物线
平移后交直线
于A,B两点,
,当平移路径最短时,求m,n的值.
【问题初探】数学小组先以抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0757ca2a03cb7611104a9a840e84fa7c.png)
(1)k的值为____________,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c981c1457633674b3a7b58d211032256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
【探究归纳】同学们对函数图象向左平移1个单位,解析式中的x反而变为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b5a9de8a72dda70e3eefeb0a408ffd.png)
定义:函数图象按
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d0c3b9f8438c1733e05b32c4d90e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8e2c7371b068c96d5ec34d134ac675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d082973139104a6023c0166de44b729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc453160e90d7b2196225110f6a72351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dce8b1c2ea5230fb9405fa6a064531e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9f7b8b78a4032d218c1d2d83d0890d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64752fba6f57f583d1220d1fc7d73b4.png)
设抛物线为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a8eb194c397afdb40737d432f87266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74415d7bd115454770f123ee207f637c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9f4a300da9d5f26b32e5a141c9896c.png)
(2)若反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45ba602e142644c6ad9f802b9ce4afd.png)
(3)若抛物线按
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5e761af39bc1725915c3c9ee7febee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ea412665e3af61cb99cc3cd4764e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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真题
【推荐1】已知抛物线
与x轴交于A.B两点,与y轴交于C点,抛物线的顶点为D点,点A的坐标为(﹣1,0).
![](https://img.xkw.com/dksih/QBM/2013/8/8/1573676497289216/1573676503490560/STEM/fbc90161e9e24cd6b037136c9b987cd0.png?resizew=483)
(1)求D点的坐标;
(2)如图1,连接AC,BD并延长交于点E,求∠E的度数;
(3)如图2,已知点P(﹣4,0),点Q在x轴下方的抛物线上,直线PQ交线段AC于点M,当∠PMA=∠E时,求点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff53fa267400edcff57a69bad81d6f.png)
![](https://img.xkw.com/dksih/QBM/2013/8/8/1573676497289216/1573676503490560/STEM/fbc90161e9e24cd6b037136c9b987cd0.png?resizew=483)
(1)求D点的坐标;
(2)如图1,连接AC,BD并延长交于点E,求∠E的度数;
(3)如图2,已知点P(﹣4,0),点Q在x轴下方的抛物线上,直线PQ交线段AC于点M,当∠PMA=∠E时,求点Q的坐标.
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【推荐2】已知抛物线
.
(1)若抛物线的顶点在x轴,求b的值;
(2)当
时,函数y的最大值等于3,求b的值.
(3)当
时,抛物线与x轴交于A、B两点(A在B的左侧),与y轴交于点C,点P为第一象限内抛物线上一点,连接AP、BC,交于点Q.请判断:
是否有最大值,如有请求出有最大值时点P的坐标,如没有请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c512c40a82da9fc4d3d0c3607e2214f.png)
(1)若抛物线的顶点在x轴,求b的值;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a12a30935c79ae769818043a496f53.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef8cffd25d418b2bbf26cbdd5a4cd9c.png)
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【推荐1】抛物线
与
轴相交于
两点 (点
在点
左侧), 与
轴交于点
, 其顶点
的纵坐标为 4.
(1)求该抛物线的表达式;
(2)求
的正切值;
(3)点
在线段
的延长线上, 且
, 求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9b0fcaa6deb9bac941a4366c44f7ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.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/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2888361930883072/2889331541688320/STEM/db40a0d1-a1c1-46f9-b6ed-66b1dd51ecd8.png?resizew=357)
(1)求该抛物线的表达式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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解答题-证明题
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较难
(0.4)
【推荐2】如图,在平面直角坐标系中,抛物线y1=ax(x﹣2)与x轴交于O、A两点,顶点为M,对称轴BM交抛物线
于点B,交x轴于点C,连接OB、AB、OM、AM,已知0<a<4,四边形OMAB的面积为S.
特例探究:填表:
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120662336536576/2121532592848896/STEM/7f29f49b944d48769f49ed106cbd574f.png?resizew=558)
归纳证明:
当a=2时,证明四边形OMAB是菱形;
拓展应用
(1)将抛物线y1=ax(x﹣2)改为抛物线y3=ax(x﹣2m)(m>0),其他条件不变,当四边形OMAB为正方形时,a= ,m= .
(2)将抛物线y1=ax(x﹣2)改为抛物线y3=ax(x﹣2m)(m>0),其他条件不变,S= (用含m的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab97c728bb948b896ff9d9127fc92af.png)
特例探究:填表:
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120662336536576/2121532592848896/STEM/7f29f49b944d48769f49ed106cbd574f.png?resizew=558)
归纳证明:
当a=2时,证明四边形OMAB是菱形;
拓展应用
(1)将抛物线y1=ax(x﹣2)改为抛物线y3=ax(x﹣2m)(m>0),其他条件不变,当四边形OMAB为正方形时,a= ,m= .
(2)将抛物线y1=ax(x﹣2)改为抛物线y3=ax(x﹣2m)(m>0),其他条件不变,S= (用含m的代数式表示).
![](https://img.xkw.com/dksih/QBM/2019/1/17/2120662336536576/2121532592848896/STEM/5f59f9090c7f434f867e77183c4de546.png?resizew=177)
您最近一年使用:0次