综合与实践
问题情境:
矩形ABCD中,AB=2,∠ADB=30°,将△BCD沿着对角线BD所在的直线平移,得到△B′C′D′,连接AB′,DC′.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/8e42733a-f530-42f7-8cd7-3a1e5a2cc90b.png?resizew=670)
操作探究:
(1)如图1,当△BCD沿射线BD的方向平移时,请判断AB′与DC′的长度有何关系?并说明理由;
(2)如图2,当△BCD沿射线DB的方向平移时,四边形AB′C′D能成为菱形吗?若能,求出平移的距离;若不能,说明理由;
(3)当△BCD平移距离为2时,请你在备用图中画出平移后的图形(除图2),并提出一个问题,直接写出结论.
问题情境:
矩形ABCD中,AB=2,∠ADB=30°,将△BCD沿着对角线BD所在的直线平移,得到△B′C′D′,连接AB′,DC′.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/8e42733a-f530-42f7-8cd7-3a1e5a2cc90b.png?resizew=670)
操作探究:
(1)如图1,当△BCD沿射线BD的方向平移时,请判断AB′与DC′的长度有何关系?并说明理由;
(2)如图2,当△BCD沿射线DB的方向平移时,四边形AB′C′D能成为菱形吗?若能,求出平移的距离;若不能,说明理由;
(3)当△BCD平移距离为2时,请你在备用图中画出平移后的图形(除图2),并提出一个问题,直接写出结论.
21-22八年级下·山西吕梁·期末 查看更多[2]
更新时间:2022-08-29 09:51:35
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【推荐1】已知菱形
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,
,
为对角线
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同时出发,相向而行,速度均为
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(1)直接写出
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的中点,
,求证:四边形
始终为平行四边形;
(3)在(2)的条件下,若四边形
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(1)直接写出
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(2)若
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(3)在(2)的条件下,若四边形
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【推荐2】已知,⊙O过矩形ABCD的顶点D,且与AB相切于点E,⊙O分别交BC,CD于H,F,G三点.
(1)如图1,求证:BE-AE=CG;
(2)如图2,连接DF,DE.若AE=3,AD=9,tan∠EDF=
,求FC的值.
(1)如图1,求证:BE-AE=CG;
(2)如图2,连接DF,DE.若AE=3,AD=9,tan∠EDF=
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【推荐3】如图,四边形ABCD中,AD
BC,AD=18,BC=30,AB=DC=12,动点P从点D出发,以每秒1个单位长的速度沿线段DA的方向向点A运动,动点Q从点C出发,以每秒2个单位长的速度沿射线CB的方向运动,点P、Q分别从点D、C同时出发,当点P运动到点A时,点Q随之停止运动.设运动的时间为t(秒).
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(1)当t=3时,求△APQ的面积;
(2)若四边形ABQP为平行四边形,求运动时间t;
(3)是否存在t,使得以A、P、Q三点为顶点的三角形是等腰三角形?若存在,直接写出点t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/63d79457-6f43-4fdf-9d29-73077593ca8d.png?resizew=184)
(1)当t=3时,求△APQ的面积;
(2)若四边形ABQP为平行四边形,求运动时间t;
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【推荐1】在菱形ABCD中,对角线AC、BD相交于点O,过点O直线EF分别交DA、BC的延长线于点E、F,连接BE、DF.
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【推荐2】如图,菱形
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(2)如图2,当
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(1)如图1,当
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(2)如图2,当
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【推荐1】如图,
中,
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是
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作
交
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于点
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;
(2)请你添加一个条件 ,使四边形
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(3)在(2)的条件下,若
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,点D,E分别为AB,AC的中点,连接DE,将△ADE绕点E旋转180°,得到△CFE,连接AF,CD.
(1)四边形ADCF是什么特殊的四边形?说明理由;
(2)若BC=8,AC=6,求四边形ABCF的周长.
(1)四边形ADCF是什么特殊的四边形?说明理由;
(2)若BC=8,AC=6,求四边形ABCF的周长.
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解答题-作图题
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较难
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【推荐1】如图1,在
中,
,以
为底边作等腰
,连接
,作
,使得
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.
(1)如图2,若
,请按题意补全图形,并写出画图步骤;
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沿
的方向平移得到线段
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(1)如图2,若
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(2)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
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①如图3,若
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②若
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名校
【推荐2】如图(1),在矩形
中,
,
,在
中,
,
,
,
的一边
和矩形的一边
在同一直线上,点
和点
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将从
以每秒
个单位的速度向
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与点
重合时停止运动,设运动时间为
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/8b4cc8d9-96ad-4574-a2e4-3f9a13bb5230.png?resizew=510)
(1)如图(2),当
过点
时,求
的值;
(2)如图(3),当
与
重合时,
与
、
分别交于点
、
,求
的长;
(3)在整个运动过程中,设
与
重叠部分面积为
,请求出
与
的函数关系式,并写出相应
的取值范围.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/8b4cc8d9-96ad-4574-a2e4-3f9a13bb5230.png?resizew=510)
(1)如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)如图(3),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
(3)在整个运动过程中,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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