如图,D、E分别是△ABC的边BC、AB上的点,△ABC,△BDE,△ACD的周长依次为
,
,
.
(1)当∠2=∠3,BD=
BC时,求
的值;
(2)当∠1=∠2,BD=
BC时,求
的值;
(3)当∠1=∠2=∠3时,证明:
≤
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
(1)当∠2=∠3,BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f44085f08467a8ae3d5bc09488510.png)
(2)当∠1=∠2,BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c119dd0eb4efccd4aedc94486a30db65.png)
(3)当∠1=∠2=∠3时,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2c358145e3fcfd963f3e23c0a91f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://img.xkw.com/dksih/QBM/2017/10/15/1795993440657408/1796014170677248/STEM/8fa14c34d01b4d84978725e717623187.png?resizew=161)
更新时间:2017-10-15 21:43:05
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,直线
分别交
轴,
轴正半轴于
两点,直线
与
轴交于点
,与直线
交于点
,且点
的纵坐标为l.
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532743102316544/2558318617518080/STEM/1abc4530-cd3a-4a04-89ce-73e5718f03fa.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532743102316544/2558318617518080/STEM/ee2f50b7-5ed6-44a1-bfc5-f93d56fe3eda.png)
(1)求
的值;
(2)线段
上有一动点
由
出发以每秒
个单位长度的速度向
运动,有另一动点
由
出发以每秒
个单位长度的速度沿射线
运动,两点同时运动,当点
停止运动时点
也停止运动.设两点运动时间为
,连接
,设
的面积为
,求
与
的函数关系式,并直接写出自变量
的取值范围;
(3)在(2)的条件下,当
运动到线段
的延长线上且
取得最大值时,连接
并延长交
轴于点
,在线段
取一点
,使
,连接
,将射线
绕点
顺时针旋转交线段
于点
,在射线
上依次取点
,连接
,
,若
,且
时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ab3a7eb0f59993c7608576e47c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c7ed83ed2e74dc103584fc5f45f89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ab3a7eb0f59993c7608576e47c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532743102316544/2558318617518080/STEM/1abc4530-cd3a-4a04-89ce-73e5718f03fa.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532743102316544/2558318617518080/STEM/ee2f50b7-5ed6-44a1-bfc5-f93d56fe3eda.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cb9a526f2b146415a98051b4e58b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/36a1b09c653185842513e24ebba60bb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c22de0d4c97b86884a678cf6a835ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c023f4b501684abd869b36d6e6c7f21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
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解答题-问答题
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适中
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【推荐2】如图(1),OABC是一张放在平面直角坐标系中的矩形纸片,O为坐标原点,点A在x轴的正半轴上,点C在y轴的正半轴上,OA=5,OC=4,在OC边上取一点D,将将纸片沿AD翻转,使点O落在BC边上的点E处.
(1)请直接写出D、E两点的坐标;
(2)如图(2),线段AE上有一动点P(不与A,E重合),自点A沿AE方向做匀速运动,运动的速度为每秒1个单位长度,设运动时间为t秒,过点P作ED的平行线交AD于点M,过点M作AE平行线交DE于点N.求四边形PMNE的面积S与时间t之间的函数关系式;
(3)在(2)的条件下,当t为何值时,以A,M,E为顶点的三角形是等腰三角形?
(1)请直接写出D、E两点的坐标;
(2)如图(2),线段AE上有一动点P(不与A,E重合),自点A沿AE方向做匀速运动,运动的速度为每秒1个单位长度,设运动时间为t秒,过点P作ED的平行线交AD于点M,过点M作AE平行线交DE于点N.求四边形PMNE的面积S与时间t之间的函数关系式;
(3)在(2)的条件下,当t为何值时,以A,M,E为顶点的三角形是等腰三角形?
![](https://img.xkw.com/dksih/QBM/2019/1/10/2115825574592512/2119094505021440/STEM/da238c57146e4d4daabd0735828b26c3.png?resizew=329)
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