【问题背景】
(1)如图1,在正方形
中,E是对角线
上一点,连接
,点F为射线
上一点(不与射线端点A重合),且
.过点E分别作
于点N.
于点M,可得线段
与线段
之间的关系为 ,请写出证明过程;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/6121d2c6-7aac-467b-aae0-d11691d7aa92.png?resizew=134)
【类比探究】
(2)如图2,将(1)中的正方形
改为矩形
,其他条件均不变,若
,
,探究线段
与线段
之间的关系并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/f474767b-276c-4936-a564-7946bd02c69e.png?resizew=117)
【拓展延伸】
(3)如图3,在(2)的条件下,过点E作
交
于点H,延长
交
边于点G.若
是以
为底的等腰三角形,直接写出
的值.
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbfc27819a18897723043fe0c5b5043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda3727ef9ce7db2496d0d4c2faa36e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa9ef3ee8838c3e3f5ecdfd0c093418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/6121d2c6-7aac-467b-aae0-d11691d7aa92.png?resizew=134)
【类比探究】
(2)如图2,将(1)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/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/f474767b-276c-4936-a564-7946bd02c69e.png?resizew=117)
【拓展延伸】
(3)如图3,在(2)的条件下,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f1054e3a5c0fc7dca3d285108112c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8caf6109fc19ea33e6623e7df12d9ccc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/c78ba866-12d4-48ab-b859-912e52b64835.png?resizew=142)
更新时间:2023-04-05 10:26:17
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相似题推荐
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【推荐1】定义:对于一个四边形,我们把依次连接它的各边中点得到的新四边形叫做原四边形的“中点四边形”.如果原四边形的中点四边形是个正方形,我们把这个原四边形叫做“中方四边形”.
【概念理解】
(1)在已经学过的“
平行四边形;
矩形;
菱形;
正方形”中,______的“中点四边形”一定是正方形,因此它一定是“中方四边形”(填序号).
【性质探究】
(2)如图1,若四边形
是“中方四边形”,观察图形,写出关于四边形
的一条结论:______.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/adbdd7fe-b703-40ec-ac00-ac0f69e95c9e.png?resizew=135)
【问题解决】
(3)如图2,以锐角
的两边
为边长,分别向外侧作正方形
和正方形
,连结
,依次连接四边形
的四边中点得到四边形
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/93513b53-1680-4283-b742-df9a989ded7a.png?resizew=164)
求证:四边形
是“中方四边形”.
【概念理解】
(1)在已经学过的“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.png)
【性质探究】
(2)如图1,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/adbdd7fe-b703-40ec-ac00-ac0f69e95c9e.png?resizew=135)
【问题解决】
(3)如图2,以锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac617b939b4e28b479fa8f555ab14a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693cd6179b2a92f03153ce12a0e86b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79ba22f53e106dc9b1ced91955afbfc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/93513b53-1680-4283-b742-df9a989ded7a.png?resizew=164)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693cd6179b2a92f03153ce12a0e86b95.png)
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【推荐2】如图,点E为▱ABCD的边AD上的一点,连接EB并延长,使BF=BE,连接EC并延长,使CG=CE,连接FG.H为FG的中点,连接DH,AF.
(1)若∠BAE=70°,∠DCE=20°,求∠DEC的度数;
(2)求证:四边形AFHD为平行四边形;
(3)连接EH,交BC于点O,若OC=OH,求证:EF⊥EG.
(1)若∠BAE=70°,∠DCE=20°,求∠DEC的度数;
(2)求证:四边形AFHD为平行四边形;
(3)连接EH,交BC于点O,若OC=OH,求证:EF⊥EG.
![](https://img.xkw.com/dksih/QBM/2020/9/24/2556409015246848/2557260563496960/STEM/73862ca8a3cd40b2bb9a62c89d2a8d9b.png?resizew=198)
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【推荐1】【问题背景】如图1,小正方形BEFG绕大正方形ABCD的顶点B旋转一周,其中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/9459d686-22dc-4c6d-9555-b2e4ce4917b1.png?resizew=504)
(1)【问题探究】猜想AE与CG的数量关系是______,位置关系是______,请对上述猜想加以说明.
(2)如图2,当点E在正方形ABCD内,连接EC,若
,
,求线段AE长.
(3)【问题拓展】在旋转过程中,当C、E、F三点共线时,线段CF的长为______.
(4)如图3,连接DF,取DF中点M,连接EM,则线段EM的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/9459d686-22dc-4c6d-9555-b2e4ce4917b1.png?resizew=504)
(1)【问题探究】猜想AE与CG的数量关系是______,位置关系是______,请对上述猜想加以说明.
(2)如图2,当点E在正方形ABCD内,连接EC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4951b4ff78df3194a18e8daeb09e6171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6bc81215e39403657999a496356c5e.png)
(3)【问题拓展】在旋转过程中,当C、E、F三点共线时,线段CF的长为______.
(4)如图3,连接DF,取DF中点M,连接EM,则线段EM的取值范围是______.
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【推荐2】如图,在平面直角坐标系中,二次函数
的图像与x轴交于点
,
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fb0a33ce-166c-4d92-9a70-b0138126c557.png?resizew=137)
(1)
______,
______;
(2)若点P是该抛物线对称轴上的一点,点Q为坐标平面内一点,那么在抛物线上且位于x轴上方是否存在点M,使四边形
为正方形?若存在,请直接写出点M的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fb0a33ce-166c-4d92-9a70-b0138126c557.png?resizew=137)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)若点P是该抛物线对称轴上的一点,点Q为坐标平面内一点,那么在抛物线上且位于x轴上方是否存在点M,使四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7096e74edfb1830dea70feec95859053.png)
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【推荐1】如图,已知AB⊥BC,CD⊥BC,AB=4,CD=2.P为线段BC上的点,设BC=m.
⑴若m=9,
①若△BAP∽△CDP,求线段BP的长;
②若△BAP∽△CPD,求线段BP的长;
⑵试求m为何值时,使得△BAP与△CDP相似的点P有且只有2个.
⑴若m=9,
①若△BAP∽△CDP,求线段BP的长;
②若△BAP∽△CPD,求线段BP的长;
⑵试求m为何值时,使得△BAP与△CDP相似的点P有且只有2个.
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101493500182528/2103939907166208/STEM/5aef91c8fd994a00abe001ccac347fa7.png?resizew=215)
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【推荐2】两个等腰直角三角形如图放置,∠B=∠CAD=90°,AB=BC=
cm,AC=AD,垂直于CD的直线a从点C出发,以每秒
cm的速度沿CD方向匀速平移,与CD交于点E,与折线BAD交于点F;与此同时,点G从点D出发,以每秒1cm的速度沿着DA的方向运动;当点G落在直线a上,点G与直线a同时停止运动;设运动时间为t秒(t>0).
(1)填空:CD=_______cm;
(2)连接EG、FG,设△EFG的面积为y,求y与t之间的函数关系式,并写出相应t的取值范围;
(3)是否存在某一时刻t(0<t<2),作∠ADC的平分线DM交EF于点M,是否存在点M是EF的中点?若存在,求此时的t值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957222216073216/1958109952688128/STEM/ec2ed8d91fc8490b80d7a48ca910730a.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957222216073216/1958109952688128/STEM/73e19dff5f0b4b3aaeca1b9f4f2cfcf5.png?resizew=231)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)填空:CD=_______cm;
(2)连接EG、FG,设△EFG的面积为y,求y与t之间的函数关系式,并写出相应t的取值范围;
(3)是否存在某一时刻t(0<t<2),作∠ADC的平分线DM交EF于点M,是否存在点M是EF的中点?若存在,求此时的t值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957222216073216/1958109952688128/STEM/ec2ed8d91fc8490b80d7a48ca910730a.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957222216073216/1958109952688128/STEM/73e19dff5f0b4b3aaeca1b9f4f2cfcf5.png?resizew=231)
![](https://img.xkw.com/dksih/QBM/2018/5/31/1957222216073216/1958109952688128/STEM/23e56b5fed3e4d82b28988ce98683987.png?resizew=231)
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【推荐1】如图,抛物线
的顶点为点D,与y轴相交于点C,与直线
交于点A、B,且点A在x轴的负半轴上.
(1)求抛物线的函数表达式及顶点D的坐标;
(2)求点C到直线
的距离;
(3)点P是对称轴右侧抛物线上的一点,连接
、
,
交对称轴于点M,当
最小时,求证:
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1be55ce3ff86ba89cb1c84dc88ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/dcbacb6e-15e3-430e-9145-39d8f0b704a6.jpg?resizew=177)
(1)求抛物线的函数表达式及顶点D的坐标;
(2)求点C到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)点P是对称轴右侧抛物线上的一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef821a21319ab270865a77caecb0fecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea98cd15fa4c868eb83ca260c6d9ae6.png)
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名校
【推荐2】已知抛物线
经过
,
两点.
(1)当
时,求a,b应满足的关系式;
(2)当
时,抛物线与直线
有且只有一个交点,且该交点在x轴上.
①求a,k应满足的关系式;
②若
,
,直线
与抛物线交于M,N两点,位于直线
的两侧.当
平分
时,求p,q应满足的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e927521ec50d886fc50746f788961d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81deada4bb68afc6091306cdd16e36a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2b990b426b17d33113bfc080ee676b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc5b4357fd97fc6a2328953fe45a294.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/087c617ff25126d2cd6428b2cd62ff47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212d499bc3042676d7fe366e3f1cf5b.png)
①求a,k应满足的关系式;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbd5bb726a08c308b48373afebbb768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b04816afb09658425297a9820dd4e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1ef66f4f5c672aaf140543287f0ef9.png)
![](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/358c69b4f6c350c35d19d33c69f2a2a8.png)
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