如图,在边长为4的正方形ABCD中,动点E以每秒1个单位长度的速度从点A开始沿边AB向点B运动,动点F以每秒2个单位长度的速度从点B开始沿边BC向点C运动,动点E比动点F先出发1秒,其中一个动点到达终点时,另一个动点也随之停止运动设点F的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2020/3/19/2422858618413056/2423762936266752/STEM/3338d05d3dac4ffdad76f35e7d025c0c.png?resizew=243)
(1)如图1,连接DE,AF.若DE⊥AF,求t的值;
(2)如图2,连结EF,DF.当t为何值时,△EBF∽△DCF?
![](https://img.xkw.com/dksih/QBM/2020/3/19/2422858618413056/2423762936266752/STEM/3338d05d3dac4ffdad76f35e7d025c0c.png?resizew=243)
(1)如图1,连接DE,AF.若DE⊥AF,求t的值;
(2)如图2,连结EF,DF.当t为何值时,△EBF∽△DCF?
18-19八年级下·山东烟台·期末 查看更多[5]
山东省莱州市2018-2019学年八年级下学期期末学业水平检测数学试题山东省烟台市莱州市2018-2019学年八年级下学期期末数学试题(已下线)专题15动点综合问题-决胜2020年中考数学压轴题全揭秘精品(2)江西省抚州市南丰县2019-2020学年九年级上学期期中数学试题(已下线)期中测试卷01-2022-2023学年九年级数学上册课后培优分级练(北师大版)
更新时间:2020-03-20 19:41:13
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解答题-问答题
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【推荐1】如图,正方形
中,
是
边上的动点,
交
延长线于点
,
交
于点
,连接
.
,求
的长;
(2)若点
是
的中点,探究
、
、
的数量关系,并说明理由;
(3)正方形
的边长为2,直接写出四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ed934aa29859e93b1f758229a12581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
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名校
解题方法
【推荐2】如图1,在正方形ABCD中,边长为2a,点E是AB边上的一个动点(点E与点A,B不重合),连接CE,过点B作BF⊥CE于点G,交AD于点F.
(1)求证:AF=BE;
(2)如图2,当点E运动到AB中点时,连接DG,求证:DG=2a;
(3)如图3,在(2)的条件下,过点C作CM⊥DG于点H,分别交AD,BF于点M,N,求
的值.
(1)求证:AF=BE;
(2)如图2,当点E运动到AB中点时,连接DG,求证:DG=2a;
(3)如图3,在(2)的条件下,过点C作CM⊥DG于点H,分别交AD,BF于点M,N,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7257b25ee15cdb509fb4a9e84113c843.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/788387a9-a8c9-434f-8682-eaeaeeba2e1b.png?resizew=441)
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【推荐1】在平面直角坐标系xOy中,若P,Q为某个矩形不相邻的两个顶点,且该矩形的边均与某条坐标轴垂直,则称该矩形为点P,Q的“相关矩形”.图1为点P,Q的“相关矩形”的示意图.已知点A的坐标为(1,2).
(1)如图2,点B的坐标为(b,0).
①若b=﹣2,则点A,B的“相关矩形”的面积是 ;
②若点A,B的“相关矩形”的面积是8,则b的值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/dc5d2ee0-c5da-4d64-98ef-c249e3f1c5d8.png?resizew=518)
(2)如图3,点C在直线y=﹣1上,若点A,C的“相关矩形”是正方形,求直线AC的表达式;
(3)如图4,等边△DEF的边DE在x轴上,顶点F在y轴的正半轴上,点D的坐标为(1,0).点M的坐标为(m,2),若在△DEF的边上存在一点N,使得点M,N的“相关矩形”为正方形,请直接写出m的取值范围.
(1)如图2,点B的坐标为(b,0).
①若b=﹣2,则点A,B的“相关矩形”的面积是 ;
②若点A,B的“相关矩形”的面积是8,则b的值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/dc5d2ee0-c5da-4d64-98ef-c249e3f1c5d8.png?resizew=518)
(2)如图3,点C在直线y=﹣1上,若点A,C的“相关矩形”是正方形,求直线AC的表达式;
(3)如图4,等边△DEF的边DE在x轴上,顶点F在y轴的正半轴上,点D的坐标为(1,0).点M的坐标为(m,2),若在△DEF的边上存在一点N,使得点M,N的“相关矩形”为正方形,请直接写出m的取值范围.
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真题
【推荐2】如图,在边长为2的正方形ABCD中,以点D为圆心、DC为半径作
,点E在AB上,且与A、B两点均不重合,点M在AD上,且ME=MD,过点E作EF⊥ME,交BC于点F,连接DE、MF.
![](https://img.xkw.com/dksih/QBM/2013/9/7/1573679607652352/1573679614033920/STEM/37b7e21d73d6457cb9f80d32ab9f335a.png)
(1)求证:EF是
所在⊙D的切线;
(2)当MA=
时,求MF的长;
(3)试探究:△MFE能否是等腰直角三角形?若是,请直接写出MF的长度;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b0f9a2dd7795b1e35e8ff355b48ea2.png)
![](https://img.xkw.com/dksih/QBM/2013/9/7/1573679607652352/1573679614033920/STEM/37b7e21d73d6457cb9f80d32ab9f335a.png)
(1)求证:EF是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b0f9a2dd7795b1e35e8ff355b48ea2.png)
(2)当MA=
![](https://img.xkw.com/dksih/QBM/2013/9/7/1573679607652352/1573679614033920/STEM/8de371babadd44efba43a1e017e6ed67.png)
(3)试探究:△MFE能否是等腰直角三角形?若是,请直接写出MF的长度;若不是,请说明理由.
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【推荐1】问题背景】如图1,
中,
,
中,
,且
,求证:
;
【变式迁移】如图(2),
中,
,
,点D为
内一点,将点A绕点D顺时针旋转
得到
,连接
,求
的值;
【拓展创新】如图(3),
中,
,
,点D为
外一点,
,连接CD,求线段
之间的数量关系.(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/afdaa842-742a-4846-94c9-e0395d722b9e.png?resizew=150)
【变式迁移】如图(2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/21f99858-4d51-4969-b165-dbd344e3444c.png?resizew=149)
【拓展创新】如图(3),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e4c964637944e40857bc2297f03712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/4ef8166f-e506-4fed-bbc6-f8a7cee10079.png?resizew=165)
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解题方法
【推荐2】抛物线y=﹣x2+bx+c与x轴交于A、B两点(点A在B左边),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453824220749824/2454292735762432/STEM/68b41249404c44db8af0edf0175fe3c3.png?resizew=411)
(1)如图1,已知A(﹣1,0),B(3,0).
①直接写出抛物线的解析式;
②点H在x轴上,M(1,0),连接AC、MC、HC,若CM平分∠ACH,求H的坐标;
(2)如图2,直线y=﹣1与抛物线y=﹣x2+bx+c交于抛物线对称轴右侧的点为点D,点E与点D关于x轴对称.试判断直线DB与直线AE的位置关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453824220749824/2454292735762432/STEM/68b41249404c44db8af0edf0175fe3c3.png?resizew=411)
(1)如图1,已知A(﹣1,0),B(3,0).
①直接写出抛物线的解析式;
②点H在x轴上,M(1,0),连接AC、MC、HC,若CM平分∠ACH,求H的坐标;
(2)如图2,直线y=﹣1与抛物线y=﹣x2+bx+c交于抛物线对称轴右侧的点为点D,点E与点D关于x轴对称.试判断直线DB与直线AE的位置关系,并证明你的结论.
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【推荐1】如图,抛物线
与x轴交于点
和点
,与y轴交于点C,顶点为D,连接
与抛物线的对称轴l交于点E.
![](https://img.xkw.com/dksih/QBM/2020/7/20/2510050567405568/2510147769827328/STEM/f39f7c3e-bdce-4be3-9831-19c93558bfb6.png?resizew=180)
(1)求抛物线的表达式;
(2)点P是第一象限内抛物线上的动点,连接
,当
时,求点P的坐标;
(3)点N是对称轴l右侧抛物线上的动点,在射线
上是否存在点M,使得以点M,N,E为顶点的三角形与
相似?若存在,求点M的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9210db6a6c1f265cab9d6f6b9a1c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bda45b7f565147f18a5c83bb8a23142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe442c0a5ca33ee88c876bc703a16301.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2510050567405568/2510147769827328/STEM/f39f7c3e-bdce-4be3-9831-19c93558bfb6.png?resizew=180)
(1)求抛物线的表达式;
(2)点P是第一象限内抛物线上的动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c3cc1f331dbb2248b0829039df7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6c42c89636de7e0d47271effdd1a74.png)
(3)点N是对称轴l右侧抛物线上的动点,在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
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【推荐2】如图,在直角坐标系中,
的直角顶点
在
轴上,
,
.动点
从点
出发,以每秒
个单位长度的速度,沿
向终点
移动
同时点
从点
出发,以每秒
个单位长度的速度,沿
向终点
移动,当两个动点运动了
秒
时,解答下列问题:
(1)求点
的坐标
用含
的代数式表示![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)设
的面积为
,求
与
之间的函数表达式;
(3)在两个动点运动的过程中,是否存在某一时刻,使
是直角三角形?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7eb3a2c1708af75e441e9a84d051a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7bb4c9ee43dbf9efe04facd3677dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf3c689691f29c14ae396f60fc156fc.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在两个动点运动的过程中,是否存在某一时刻,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/b6d4d27d-6dab-4142-a73e-c587a8f163a8.png?resizew=175)
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解答题-问答题
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较难
(0.4)
解题方法
【推荐3】如图,已知抛物线经过点A(﹣1,0),B(4,0),C(0,2)三点,点D与点C关于
轴对称,点P是
轴上的一个动点,设点P的坐标为(
,0),过点P作
轴的垂线l交抛物线于点Q,交直线BD于点M.
(1)求该抛物线所表示的二次函数的表达式;
(2)点P在线段AB运动过程中,是否存在点Q,使得△BOD∽△QBM?若存在,求出点Q的坐标;若不存在,请说明理由.
(3)已知点F(0,
),当点P在
轴上运动时,试求
为何值时,以D,M,Q,F为顶点的四边形是平行四边形?
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求该抛物线所表示的二次函数的表达式;
(2)点P在线段AB运动过程中,是否存在点Q,使得△BOD∽△QBM?若存在,求出点Q的坐标;若不存在,请说明理由.
(3)已知点F(0,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2020/6/19/2487975033815040/2492473380569088/STEM/b868171a352c4a05b688ec5028ec2dc2.png?resizew=197)
您最近一年使用:0次