已知,四边形ABCD矩形,AD>AB,E、F、G分别是AB、BC、AD上的点,
=n.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/b03cac75-5593-4f28-a6fa-47325c677db3.png?resizew=548)
(1)当n=1,DE⊥EF.
①如图1.求证:
;
②如图2.连接DF.若CF=2AG.求
;
(2)如图3,n=
,AD=2AB=10,∠GEF=45°,直接写出△EFG面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/b03cac75-5593-4f28-a6fa-47325c677db3.png?resizew=548)
(1)当n=1,DE⊥EF.
①如图1.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e187e776dc985ff31e20a269459486.png)
②如图2.连接DF.若CF=2AG.求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc1db5e48db4c59fcdda8812c0431a3.png)
(2)如图3,n=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
更新时间:2022-04-25 19:58:29
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困难
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【推荐1】抛物线
与x轴交于A、B两点,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/ec1e4f6f-cbaa-47b7-bc3e-613eb67fc6cf.png?resizew=325)
(1)如图1,若点A在x轴的负半轴上,△OBC为等腰直角三角形,求抛物线的解析式;
(2)在(1)的条件下,点D(-2,5)是抛物线上一点,点M为直线BC下方抛物线上一动点,令四边形BDCM的面积为S,求S的最大值及此时点M的坐标;
(3)若点P是抛物线对称轴上一点,且点P的纵坐标为-9,作直线PC,将直线PC向下平移n(n>0)个单位长度得到直线
,若直线
与抛物线有且仅有一个交点.
①直接写出n关于m的函数关系式;
②直接写出当1≤n≤5时m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3293ca1533035fef124d37a14f5ab5a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/ec1e4f6f-cbaa-47b7-bc3e-613eb67fc6cf.png?resizew=325)
(1)如图1,若点A在x轴的负半轴上,△OBC为等腰直角三角形,求抛物线的解析式;
(2)在(1)的条件下,点D(-2,5)是抛物线上一点,点M为直线BC下方抛物线上一动点,令四边形BDCM的面积为S,求S的最大值及此时点M的坐标;
(3)若点P是抛物线对称轴上一点,且点P的纵坐标为-9,作直线PC,将直线PC向下平移n(n>0)个单位长度得到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c10975392597a5d2758e8a611dc5143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c10975392597a5d2758e8a611dc5143.png)
①直接写出n关于m的函数关系式;
②直接写出当1≤n≤5时m的取值范围.
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【推荐2】如图,点P是线段BD上一个动点,∠B=∠D=90°,AB=6,CD=4,BD=a.
(1)当∠APC=90°,a=14时,求BP的长度;
(2)若∠APC=90°时,点P有两个符合要求即P1,P2,且P1P2=2,求a的值;
(3)若∠APC=120°时,点P有且只有一个点符合要求,求a的值.
(1)当∠APC=90°,a=14时,求BP的长度;
(2)若∠APC=90°时,点P有两个符合要求即P1,P2,且P1P2=2,求a的值;
(3)若∠APC=120°时,点P有且只有一个点符合要求,求a的值.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465148374540288/2466135012229120/STEM/b0fa530141bf4f0b82cb8886d79b1278.png?resizew=195)
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【推荐3】已知抛物线y=ax2+bx+c经过点A(-1,1),且对于该抛物线上任意两点P1(x1,y1),P2(x2,y2),
当x1<x2<0时,总有y1>y2.
(1)当点B在该抛物线上,且AB‖x轴,AB=4,求a、b满足的关系式;
(2)若点A关于y轴的对称点恰好在该抛物线上,且一元二次方程ax2+bx+c=0有两个相等的实数根.
①求该抛物线的解析式;
②过点(0,
)的直线与抛物线交于C、D两点,点E是CD中点,已知:直线l:y=
,过点E作EF⊥直线l于点F,求证:2EF=CD.
当x1<x2<0时,总有y1>y2.
(1)当点B在该抛物线上,且AB‖x轴,AB=4,求a、b满足的关系式;
(2)若点A关于y轴的对称点恰好在该抛物线上,且一元二次方程ax2+bx+c=0有两个相等的实数根.
①求该抛物线的解析式;
②过点(0,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44aa2c469b5308c947f517529253b36f.png)
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解题方法
【推荐1】如图1,在平行四边形
中,
,点
在线段
上,点
在线段
上,连接
,且
.
(1)连接
,若
,求线段
的长.
(2)将
绕
点沿顺时针方向旋转到如图2所示的位置,连接
交
边于点
,延长
交
于
,且
为
的中点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d124a152ba88e7cc4f96cd6dbfd8fdc0.png)
(3)如图3,将
绕
点沿逆时针方向旋转,连接
为
的中点,连接
,若
,在旋转的过程中,当线段
的长最大时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7793e706be2c9685f52bf2ef43df53b6.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451557ef624a9c142ebc5fa155e0e28b.png)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39e09154746683ca819797fe9d18dd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169215498c8f65f37cb3e0aad41e854f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d124a152ba88e7cc4f96cd6dbfd8fdc0.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b28b7a0739333b9eb9811309afe455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449848ce8a1aefce1831d494288c88c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8f0e6d2cf730b536186bd796d9b5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c0d0dc7c3bc189cdb529d7c145a168.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/15fe6829-8a3c-4155-a5f1-880e334ee0c2.png?resizew=355)
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【推荐2】如图,半径为1的
与
轴交于
两点,圆心
的坐标为
,二次函数
的图象经过
两点,与
轴交于点
,顶点为
,直线
与
轴交于点
.
(1)求二次函数的解析式.
(2)经过坐标原点
的直线
与
相切,求直线
的解析式.
(3)试问在
轴上是否存在点
,使
的周长最小?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a812a9b58ccba331cfd21d244329af01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求二次函数的解析式.
(2)经过坐标原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)试问在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40480e163973655b91177c8db29c0e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/e836a6a4-21ab-49c2-8484-549b9bcaa019.png?resizew=185)
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