如图,在△ABC中,∠BAC=90°,∠B=45°,BC=10cm,过点A作AD//BC,且点D在点A的右侧.点P从点A出发沿射线AD方向以每秒1cm的速度运动,同时点Q从点C出发沿射线CB方向以每秒2cm的速度运动,在线段QC上取点E,使得QE=2cm,连结PE,设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/c804a0c6-f885-4476-bca1-2bd1af29b032.png?resizew=150)
(1)①AP=_______,CE=________;(用含t的式子表示)
②若PE⊥BC,求BQ的长;
(2)请问是否存在t的值,使以A,B,E,P为顶点的四边形为平行四边形?若存在,求出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/c804a0c6-f885-4476-bca1-2bd1af29b032.png?resizew=150)
(1)①AP=_______,CE=________;(用含t的式子表示)
②若PE⊥BC,求BQ的长;
(2)请问是否存在t的值,使以A,B,E,P为顶点的四边形为平行四边形?若存在,求出t的值;若不存在,请说明理由.
20-21八年级下·浙江温州·期中 查看更多[4]
浙江省乐清市知临寄宿学校2020-2021学年八年级下学期期中联考数学试题(1-7班)(已下线)专题15 动点中的平行四边形-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(浙教版)(已下线)专题9.47 平行四边形(存在性问题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)浙江省杭州市余杭区育海外国语学校2023-2024学年八年级下学期第一次月考数学试卷
更新时间:2022-09-25 09:40:10
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解答题-证明题
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适中
(0.65)
【推荐1】如图,
内接于
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是
的直径,E为
上一点,
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与
的位置关系,并说明理由;
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(2)若
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解答题-证明题
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适中
(0.65)
名校
【推荐1】点P是平行四边形
的对角线
所在直线上的一个动点(点P不与点A、C重合),分别过点A、C向直线
作垂线,垂足分别为点E、F.点O为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/0690d88d-b50b-4465-8f31-1890efbc4e81.png?resizew=608)
(1)如图1,当点P与点O重合时,线段
和
的数量关系是 ;
(2)当点P运动到如图2所示的位置时,请通过证明判断(1)中的结论是否仍然成立?如果成立请给予证明,如果不成立请说明理由;
(3)如图3,点P在线段
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时,试探究线段
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(1)如图1,当点P与点O重合时,线段
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(2)当点P运动到如图2所示的位置时,请通过证明判断(1)中的结论是否仍然成立?如果成立请给予证明,如果不成立请说明理由;
(3)如图3,点P在线段
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【推荐2】如图,在平行四边形
中,
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于点
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.
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(2)若
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解答题-证明题
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适中
(0.65)
【推荐1】已知:E、F分别为正方形的边DC、BC上两点且
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图1 图2 图3
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(2)如图2,过E作
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
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(1)求证:
为等边三角形;
(2)求证:
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