已知:如图,在矩形
中,
,点E为边
的中点,连接
,
交
于点F.点P从点B出发,沿
方向匀速运动,速度为2cm/s;同时,点Q从点A出发,沿
方问匀速运动,速度为3cm/s,当一个点停止运动时,另一个点也停止运动.设运动时间为
.解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/3f4e7d02-bf61-4ed6-be98-d789f3b100b7.png?resizew=131)
(1)当t为何值时,点P在线段
的垂直平分线上?
(2)连接
,设五边形
的面积为
,求y与t的函数关系式;
(3)在运动过程中,是否存在某一时刻
,使点Q在
的平分线上?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a560d6e956cb4c1c3ce8dff25801ecf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12d00820facec9c71c3d800384e3ccd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/3f4e7d02-bf61-4ed6-be98-d789f3b100b7.png?resizew=131)
(1)当t为何值时,点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de9991f750e3aba09ca840cdb9a09b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012b14b48c09eb820c49c13dccb642bb.png)
(3)在运动过程中,是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
更新时间:2024-01-17 15:59:03
|
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解答题-问答题
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【推荐1】如图1,梯形
中,
,
,
,
,
,点P、Q分别是边
、
上的动点,且
.
(1)当四边形
是矩形时,求
的长;
(2)如果
,求
的长;
(3)当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/426f7bb2f9fa053fbbdbecac9481ffe0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/c9b2469f-96af-442c-b945-f0420496aa78.png?resizew=237)
(1)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7be5491c4a02e9d71932d2dd8cf593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8896ed0102f70210e9ba146f09ca0665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456d6b901f8246a37f521bab2ff16705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
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【推荐2】如图,在△ABC中,D为BC的中点,DE⊥BC交∠BAC的平分线AE于E,EF⊥AB于F,EG⊥AC交AC的延长线于G,AB=5,AC=3.求CG.
![](https://img.xkw.com/dksih/QBM/2019/11/18/2336390387982336/2336680622604288/STEM/0abdc2aa72314014bceb031631fc08c0.png?resizew=115)
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【推荐1】如图,在平面直角坐标系中,抛物线
与
轴相交于
、
两点(
在
的左侧),与
轴相交于点C(0,3),且
,
,抛物线的顶点为
.
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267736248320/2449737003851776/STEM/6d401a7ab2a34d1c8683f3b9d89c71af.png?resizew=199)
(1)求
、
两点的坐标.
(2)求抛物线的表达式.
(3)过点
作直线
轴,交
轴于点
,点
是抛物线上
,
两点间的一个动点(点
不与
、
两点重合),
、
与直线
分别相交于点
、
当点
运动时,
是否为定值?若是,试求出该定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2d3f02cb9007cd4a90ea30f6dd8181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9b5996067a3fc9adcf0ca178dddf03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267736248320/2449737003851776/STEM/6d401a7ab2a34d1c8683f3b9d89c71af.png?resizew=199)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求抛物线的表达式.
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5227e92ae30aec11ccea1507fbdbe77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐2】如图,在矩形ABCD中,AD=acm,AB=bcm(a>b>4),半径为2cm的⊙O在矩形内且与AB、AD均相切,现有动点P从A点出发,在矩形边上沿着A→B→C→D的方向匀速移动,当点P到达D点时停止移动.⊙O在矩形内部沿AD向右匀速平移,移动到与CD相切时立即沿原路按原速返回,当⊙O回到出发时的位置(即再次与AB相切)时停止移动,已知点P与⊙O同时开始移动,同时停止移动(即同时到达各自的终止位置).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/3915b619-4b1d-49ba-b2cd-5578ab274982.png?resizew=433)
(1)如图①,点P从A→B→C→D,全程共移动了 cm(用含a、b的代数式表示);
(2)如图①,已知点P从A点出发,移动2s到达B点,继续移动3s,到达BC的中点,若点P与⊙O的移动速度相等,求在这5s时间内圆心O移动的距离;
(3)如图②,已知a=20,b=10,是否存在如下情形:当⊙O到达⊙O1的位置时(此时圆心O1在矩形对角线BD上),DP与⊙O1恰好相切?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/3915b619-4b1d-49ba-b2cd-5578ab274982.png?resizew=433)
(1)如图①,点P从A→B→C→D,全程共移动了 cm(用含a、b的代数式表示);
(2)如图①,已知点P从A点出发,移动2s到达B点,继续移动3s,到达BC的中点,若点P与⊙O的移动速度相等,求在这5s时间内圆心O移动的距离;
(3)如图②,已知a=20,b=10,是否存在如下情形:当⊙O到达⊙O1的位置时(此时圆心O1在矩形对角线BD上),DP与⊙O1恰好相切?请说明理由.
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