已知:矩形OABC的顶点O在平面直角坐标系的原点,边OA、OC分别在x、y轴的正半轴 上,且OA=3cm,OC=4cm,点M从点A出发沿AB向终点B运动,点N从点C出发沿CA向终点A运动,点M、N同时出发,且运动的速度均为1cm/秒,当其中一个点到达终点时,另一点即停止运动.设运动的时间为t秒.
(1)当点N运动1秒时,求点N的坐标;(提示∶过N作x轴y轴垂线,垂足分别为D,ECN∶CA=CE∶CO=NE∶OA)
(2)试求出多边形OAMN的面积S与t的函数关系式;
(3)t为何值时,以△OAN的一边所在直线为对称轴翻折△OAN,翻折前后的两个三角形所组成的四边形为菱形?
(1)当点N运动1秒时,求点N的坐标;(提示∶过N作x轴y轴垂线,垂足分别为D,ECN∶CA=CE∶CO=NE∶OA)
(2)试求出多边形OAMN的面积S与t的函数关系式;
(3)t为何值时,以△OAN的一边所在直线为对称轴翻折△OAN,翻折前后的两个三角形所组成的四边形为菱形?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/63eb0bca-7638-4eea-aecd-cdc67a1aaaf7.png?resizew=129)
更新时间:2017-06-10 14:47:30
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【推荐1】如图,矩形ABCD中,BC=2AB,点E是边AD的中点,点F是线段AE上一点(点F不与点A,E重合),连接BF,过点F作直线BF的垂线,与线段CE交于点G,连接BG,点H是线段BG的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/7c5894eb-0ec2-480d-8c5e-e132b3593c08.png?resizew=156)
(1)若CE=2
,求矩形ABCD的面积;
(2)求证:BF=
EH.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/7c5894eb-0ec2-480d-8c5e-e132b3593c08.png?resizew=156)
(1)若CE=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
(2)求证:BF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
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【推荐2】在矩形
中,
,
,将矩形
绕点B顺时针旋转得到矩形
,A,C,D的对应点分别为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/cceb6687-6f54-4d6b-a030-114c1558e07b.png?resizew=604)
(1)当点
落在线段
上时,完成以下探究.
①如图1,求
的长.
②如图2,延长
交
于点E,求证:
.
(2)如图3,以
为斜边在右侧作等腰直角三角形
,
,
交
于点G,交
于点H,若
,求
的长.
(3)如图4,矩形
的对角线
与
相交于点P,连接
,
,则
面积的最小值为___.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e963c942be5c658864dee9bb352b36c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/cceb6687-6f54-4d6b-a030-114c1558e07b.png?resizew=604)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
①如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75d14708e6aa1404477db9d7e3166f0.png)
②如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bb645f59ab22e0716100d498c834b4.png)
(2)如图3,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22137ccddfe21639b4c02b24c62c73f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef669cf90972c6e6f7dda81a2facf4b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5b5d9bed01632b26ab881deab2afa.png)
(3)如图4,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79039b211d151710a15fc9dda11d6225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8be33504a6928671b97612ca15109ff.png)
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【推荐1】在
与
中,
,
,
可以绕点C旋转,连接AE,BD.
(1)如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/25d5bda5-fb2b-478e-b66a-2384b0699d0c.png?resizew=202)
①若
,直接写出线段BD与线段AE的数量关系;
②求直线BD与直线AE所夹锐角的度数;
(2)如图,
,当四边形ADCE是平行四边形时,直接写出线段DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c22ac064a8f448b3b1dee2a0d8dec35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372388799d2c7921e25ebfcb950da1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6704fbc582e68a9ae5a1fd918fa3a859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c22ac064a8f448b3b1dee2a0d8dec35.png)
(1)如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/25d5bda5-fb2b-478e-b66a-2384b0699d0c.png?resizew=202)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348a6b0f9a5840232a163dcbdf15a9c0.png)
②求直线BD与直线AE所夹锐角的度数;
(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203d0be23459ab2d6eebe9ce1e375dbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/20940bda-a6c6-453f-923e-38d5490faf6f.png?resizew=153)
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【推荐2】已知,在平面直角坐标系中,O为坐标原点,
的顶点E和R均落在x轴的正半轴上(点E在点R的右侧),线段OE的长是方程
的一个根.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/ca2d2197-20c4-4e21-8ded-ddaf82423d53.png?resizew=536)
(1)如图1,求点E的坐标;
(2)如图2,连接RH,点P为线段RH延长线上一点,且点P的纵坐标为t,连接CP、OP,设
和
的面积和为S,若
,请用含t的代数式表示S;
(3)如图3,在(2)的条件下,连接OC,若
,
,
,求线段OP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa9f906ab4ab5ec00718e17a621e761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd801d8764bac8f711911882f7b9363.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/ca2d2197-20c4-4e21-8ded-ddaf82423d53.png?resizew=536)
(1)如图1,求点E的坐标;
(2)如图2,连接RH,点P为线段RH延长线上一点,且点P的纵坐标为t,连接CP、OP,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c036eb374274491f675ec50552d517a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce82ac8555e0d0a670b5bf6e2ec28374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137c000fb8e72d3ad95521d373c85513.png)
(3)如图3,在(2)的条件下,连接OC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f040dc9725d9b6a8281ac6a0f6bb0a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abf9126083b54ad506ccfabc2078e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec8b3faee8000082685ee734426dba7.png)
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【推荐1】已知在
中,
,
分别为
边上的两动点,且在运动过程中保持
,
为
的对角线.
(1)如图①,若
,
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322512558145536/2322633886703616/STEM/5726855559e64f588845353c34e4ddb6.png?resizew=169)
①当点
与点
重合时,探索
的值;
②当点
与点
不重合时,探索
的值;
(2)如图②,参考(1)研究方法,若
,
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322512558145536/2322633886703616/STEM/ce91beff181b40e2a01300423c0d8ea8.png?resizew=208)
①当点
与点
重合时,探索
的值;
②当点
与点
不重合时,探索
的值;
(3)如图③,参考(1)(2)研究方法,若
时,试探索是否存在常数
,使得
,若存在,请直接写出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82d579a717399137b8c6d475d33cd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11872bd228050e0af8764dfa77394341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322512558145536/2322633886703616/STEM/5726855559e64f588845353c34e4ddb6.png?resizew=169)
图①
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc3e757bab73d0958a073e7e3f0e0d7.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc3e757bab73d0958a073e7e3f0e0d7.png)
(2)如图②,参考(1)研究方法,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322512558145536/2322633886703616/STEM/ce91beff181b40e2a01300423c0d8ea8.png?resizew=208)
图②
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e91a57e9c0ed3f931ac3423aa939df2e.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e91a57e9c0ed3f931ac3423aa939df2e.png)
(3)如图③,参考(1)(2)研究方法,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0655123b9076f6d5555eb624cdd0ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c07b6a3a98d4461e372596bddef0b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322512558145536/2322633886703616/STEM/999302082371414485e4d8052315535b.png?resizew=198)
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【推荐2】如图,在平面直角坐标系中,一次函数y=
x+2的图象与y轴交于A点,与x轴交于B点,⊙P的半径为
,其圆心P在x轴上运动.
(1)如图1,当圆心P的坐标为(1,0)时,求证:⊙P与直线AB相切;
(2)在(1)的条件下,点C为⊙P上在第一象限内的一点,过点C作⊙P的切线交直线AB于点D,且∠ADC=120°,求D点的坐标;
(3)如图2,若⊙P向左运动,圆心P与点B重合,且⊙P与线段AB交于E点,与线段BO相交于F点,G点为弧EF上一点,直接写出
AG+OG的最小值 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/5edca49f-262c-4534-a6c2-d50af0af6a8e.png?resizew=395)
(1)如图1,当圆心P的坐标为(1,0)时,求证:⊙P与直线AB相切;
(2)在(1)的条件下,点C为⊙P上在第一象限内的一点,过点C作⊙P的切线交直线AB于点D,且∠ADC=120°,求D点的坐标;
(3)如图2,若⊙P向左运动,圆心P与点B重合,且⊙P与线段AB交于E点,与线段BO相交于F点,G点为弧EF上一点,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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