问题发现:如图1,在△ABC中,∠C=90°,分别以AC,BC为边向外侧作正方形ACDE和正方形BCFG.
(1)△ABC和△DCF面积的关系是______________;(请在横线上填写“相等”或“不等”)
(2)拓展探究:若∠C≠90°,(1)中的结论还成立吗?若成立,请结合图2给出证明;若不成立,请说明理由;
(3)解决问题:如图3,在四边形ABCD中,AC⊥BD,且AC与BD的和为10,分别以四边形ABCD的四条边为边向外侧作正方形ABFE、正方形BCHG、正方形CDJI,正方形DALK,运用(2)的结论,图中阴影部分的面积和是否有最大值?如果有,请求出最大值,如果没有,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/c1136b86a2b9405497801d4e567db155.png?resizew=211)
图1
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/b0cda97a22b242db8e48a50e38a3ed4e.png?resizew=211)
图2
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/e903f75790bd43d5acfdfc0369488c68.png?resizew=197)
图3
(1)△ABC和△DCF面积的关系是______________;(请在横线上填写“相等”或“不等”)
(2)拓展探究:若∠C≠90°,(1)中的结论还成立吗?若成立,请结合图2给出证明;若不成立,请说明理由;
(3)解决问题:如图3,在四边形ABCD中,AC⊥BD,且AC与BD的和为10,分别以四边形ABCD的四条边为边向外侧作正方形ABFE、正方形BCHG、正方形CDJI,正方形DALK,运用(2)的结论,图中阴影部分的面积和是否有最大值?如果有,请求出最大值,如果没有,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/c1136b86a2b9405497801d4e567db155.png?resizew=211)
图1
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/b0cda97a22b242db8e48a50e38a3ed4e.png?resizew=211)
图2
![](https://img.xkw.com/dksih/QBM/2017/5/10/1684221369090048/1686848551780352/STEM/e903f75790bd43d5acfdfc0369488c68.png?resizew=197)
图3
2017·河南郑州·二模 查看更多[2]
更新时间:2017-05-14 16:05:04
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【知识点】 图形问题(实际问题与二次函数)
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【推荐1】如图,已知抛物线
经过
,
,
三点,其顶点为
,对称轴是直线
,
与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/bd5646a7-c3e7-4a37-b345-fcab485e1204.png?resizew=416)
(1)求该抛物线的解析式;
(2)若点
是该抛物线对称轴
上的一个动点,求
周长的最小值;
(3)如图(2),若
是线段
上的一个动点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
与
、
不重合),过
点作平行于
轴的直线交抛物线于点
,交
轴于点
,设点
的横坐标为
,
的面积为
.
①求
与
的函数关系式;
②
是否存在最大值?若存在,求出最大值及此时点
的坐标; 若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee80939187a84e1863eeb192a301c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b47e7bf02b3ca16f7d96b9369e51a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62855ff21228ecea8e28fd0fbeb814ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/bd5646a7-c3e7-4a37-b345-fcab485e1204.png?resizew=416)
(1)求该抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a871db2bd253dec3d9e78fd567129a27.png)
(3)如图(2),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】已知抛物线
经过点
,点
,与x轴交于另一点C,顶点为D,连接
.
(1)求该抛物线的解析式;
(2)点P为该抛物线上一动点(与点B,C不重合),设点P的横坐标为t,
①当点P在直线
的下方运动时,求
面积的最大值;
②该抛物线上是否存在点P,使得
?若存在,请直接写出点P的坐标若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c977d0f39570f4f89be26efe20cc056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求该抛物线的解析式;
(2)点P为该抛物线上一动点(与点B,C不重合),设点P的横坐标为t,
①当点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
②该抛物线上是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d193887b91e77feb497f54c7742561ed.png)
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【推荐3】如图,在平面直角坐标系中,一次函数y=
x+4的图象与x轴交于点B,与y轴交于点C,二次函数y=
x2+bx+c的图象经过点A(2,0)和点C,抛物线与x轴交于点A和点E(点A在点E的左侧),连接AC,将△ABC沿AC折叠,得到点B的对应点为点D.
(1)求二次函数的表达式;
(2)求点D坐标,并判定点D是否在该二次函数的图象上;
(3)①在线段AC上找一点F,使得△OBF的周长最小,直接写出此时点F的坐标.②在①的基础上,过点F的一条直线与抛物线对称轴右侧部分交于点N,交线段AD于点M,连接NA、ND,使△AMF与△AMN的面积比为4:1,请直接写出△AND的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)求二次函数的表达式;
(2)求点D坐标,并判定点D是否在该二次函数的图象上;
(3)①在线段AC上找一点F,使得△OBF的周长最小,直接写出此时点F的坐标.②在①的基础上,过点F的一条直线与抛物线对称轴右侧部分交于点N,交线段AD于点M,连接NA、ND,使△AMF与△AMN的面积比为4:1,请直接写出△AND的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/5ec53435-dd77-497d-abfb-49e955c52a40.png?resizew=206)
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