如图,在平面直角坐标系中,已知平行四边形
的顶点
、
,点D是
的中点,点E在
上由点B向点A运动.
(1)求点A的坐标;
(2)若点E运动速度为每秒2个单位长度,点E运动的时间为t秒,当四边形
是平行四边形时,求t的值;
(3)当
是等腰三角形时,直接写出点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d586270cde11f78e99dc841c1827a7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39e4deb32ab07067fbd9bdaf93af082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/b9a3c878-55b9-469f-b692-80a749615017.png?resizew=179)
(1)求点A的坐标;
(2)若点E运动速度为每秒2个单位长度,点E运动的时间为t秒,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e00bf73d03dded1cf5f83cc5339361.png)
更新时间:2023-06-10 10:14:38
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相似题推荐
解答题-作图题
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【推荐1】按要求作图:已知如图平面直角坐标系中,A点在第二象限到两坐标轴的距离都为4,C点位于第一象限且到x轴的距离为3,到y轴的距离为1,过A点作AB⊥x轴于B点,解答下列各题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/56777faf-6a6e-4c65-b1ac-43552fc45cd0.png?resizew=338)
(1)图中作出△ABC并计算△ABC的面积;
(2)画出△ABC先向右平移5个单位长度,再向下平移3个单位长度的△DEF.
(3)点P在直线AB上,且到A点的距离是3个单位,直接写出P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/56777faf-6a6e-4c65-b1ac-43552fc45cd0.png?resizew=338)
(1)图中作出△ABC并计算△ABC的面积;
(2)画出△ABC先向右平移5个单位长度,再向下平移3个单位长度的△DEF.
(3)点P在直线AB上,且到A点的距离是3个单位,直接写出P的坐标.
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【推荐2】已知在平面直角坐标系中,点
满足
,
轴垂足为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/6b49d22b-1a7c-4601-a026-dad4886076d9.png?resizew=279)
(1)点
的坐标为______,点
的坐标为______;
(2)如图1,若点
在坐标轴上,连接
,使
,求出点
的坐标;
(3)如图2,
是线段
所在直线上一动点,连接
,
为
轴负半轴上一点,
平分
,交直线
于点
,作
,当点
在直线
上运动过程中,请探究
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/939528bdc6326ddaf9d07c08263857ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/6b49d22b-1a7c-4601-a026-dad4886076d9.png?resizew=279)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f6960f8327c63dfa0becd64318fa679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图2,
![](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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467fe4b4911049cf77ba17962b844bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.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/36e39a7adfe03663a9387b79a7627192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858577d72cb251b0d8547e55c7dcb3aa.png)
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解答题-证明题
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【推荐1】如图,M为线段
的中点,
与
交于点C,
,且
交
于F,
交
于G
![](https://img.xkw.com/dksih/QBM/2022/10/17/3089659255431168/3095156669022208/STEM/432746cc26bc45f7b1d8c2330f0e36e9.png?resizew=170)
(1)求证:
;
(2)连接
,如果
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b0810629886f9ab1faaa48dda847cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/10/17/3089659255431168/3095156669022208/STEM/432746cc26bc45f7b1d8c2330f0e36e9.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c435de83ceeb04b82bab84b1c26c2e.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6613ceadf3aa225485900b58a84939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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解答题-作图题
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【推荐2】人教版八年级上册课本第85页中有下面这道题:
问题解决:
如图3,作出点B关于l的对称点
,利用轴对称的性质,问题就转化为:当点C在直线l的什么位置时,
与
的和最小?
如图4,在连接A,
两点的线中,线段
与直线l的交点C的位置即为所求.
数学思考:
有很多问题都可用类似的方法去思考解决.
(1)如图5,在等边三角形
中,
是
边上的高,E为
的中点,P为
上一动点,若
,求
周长的最小值;
(2)如图6,在
中,
,
是
边上的中线,点E是
上一动点,P为
上一动点,
,则
的最小值为 .
问题1.如图1,牧马人从A地出发,到一条笔直的河边l饮马,可使所走的路径最短?![]() |
如图3,作出点B关于l的对称点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffb952f86442845da723fd291564484.png)
如图4,在连接A,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/a15b24e2-4018-4c67-90d4-094098cda9ae.png?resizew=558)
数学思考:
有很多问题都可用类似的方法去思考解决.
(1)如图5,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
(2)如图6,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef98fdbaa33fc752c802e833f8b08a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d97b922f251e8e02b272778bb44635.png)
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解答题-问答题
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(0.65)
【推荐1】如图,直线
与y轴交于点A,与x轴交于点E,点
在该直线上,
的顶点D在x轴上,反比例函数
的图象经过点B,C.
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650353eda77d014bb42d185bd967e549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ceb39610f37d96ce4de571063a32cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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解题方法
【推荐2】如图所示,在直角梯形
中,
,
,
,
,
.动点P从点B出发,沿射线
的方向以每秒2个单位长度的速度运动,动点Q同时从点A出发,在线段
上以每秒1个单位长度的速度向点D运动,当其中一个动点到达端点时停止运动、另一个动点也随之停止运动,设运动的时间为t秒.
![](https://img.xkw.com/dksih/QBM/2023/6/1/3250144444375040/3250370023948288/STEM/8c4a0a5575254b2cb3d8a0a88536b696.png?resizew=400)
(1)设
的面积为S,S=__ (用含t的式子表示S);
(2)当t为何值时,四边形
是平行四边形?
(3)分别求出当t为何值时,
①
;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2998ab763026296c102fafd8e9de0fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88c5025689144c57cf36d1851ebc026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2023/6/1/3250144444375040/3250370023948288/STEM/8c4a0a5575254b2cb3d8a0a88536b696.png?resizew=400)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
(2)当t为何值时,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3dac3f1a7727e2b848e5881a03a8bf.png)
(3)分别求出当t为何值时,
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f104c021d664284a700c31f6fc2528b4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cae9f680c413841b3c8239e9d119667.png)
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