如图,已知△ABC中,AB=BC,D为AC中点,过点D作DE∥BC,交AB于点E.
(1)求证:AE=DE;
(2)若∠C=65°,求∠BDE的度数.
(1)求证:AE=DE;
(2)若∠C=65°,求∠BDE的度数.
![](https://img.xkw.com/dksih/QBM/2019/3/12/2159030505390080/2159849689702400/STEM/00fb44067866413782cb02b335806833.png?resizew=142)
更新时间:2019-03-13 22:48:21
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,已知△ABC.
(1)若AB=4,AC=5,则BC边的取值范围是_____;
(2)点D为BC延长线上一点,过点D作DE∥AC,交BA的延长线于点E,若∠E=55°,∠ACD=125°,求∠B的度数.
(1)若AB=4,AC=5,则BC边的取值范围是_____;
(2)点D为BC延长线上一点,过点D作DE∥AC,交BA的延长线于点E,若∠E=55°,∠ACD=125°,求∠B的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/bc512631-f32b-4778-ab96-29b410f75bda.png?resizew=202)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知AD是△ABC的角平分线,点E在BC上,点F在CA的延长线上,EF∥AD,EF交AB于点G.
![](https://img.xkw.com/dksih/QBM/2019/6/5/2219163170242560/2223513276358656/STEM/d8e8eb16da6c4ef09199333daf9efe0c.png?resizew=159)
求证:∠AGF=∠F.
![](https://img.xkw.com/dksih/QBM/2019/6/5/2219163170242560/2223513276358656/STEM/d8e8eb16da6c4ef09199333daf9efe0c.png?resizew=159)
求证:∠AGF=∠F.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】解答题
(1)问题发现
如图1,把一块三角板(
,
)放入一个“
”形槽中,使三角形的三个顶点
、
、
分别在槽的两壁及底边上滑动,已知
,在滑动过程中,发现与
始终相等的角是 ,与线段
相等的线段是 ;
(2)拓展探究
如图2,在
中,点
在边
上,并且
,
.求证:
.
(3)能力提升
如图3,在等边
中,
,
分别为
、
边上的点,
,连接
,以
为边在
内作等边
,连接
,当
时,请直接写出
的长度.
(1)问题发现
如图1,把一块三角板(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d30c2757cadb2af80ea041a1af853fe.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d50a529b1cf3018da2d1b6f477d2cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)拓展探究
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810242c9205006b28c6bc6612c2b1cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1fdd476e86e5b709835f0ce3c3601c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61986b1ae0ef86fe3a2ff67192e5a773.png)
(3)能力提升
如图3,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bc239fb7a5149065d87ca57e373837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/1/5ed4ef99-06ed-447a-a6ce-194968c3bc48.png?resizew=482)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】在我市万丰湖景区,有处湖道两岸所在直线
如图所示,在湖道两岸安装探照灯P和Q,若灯P射线自
逆时针旋转至
便立即回转,灯Q射线自
逆时针旋转至
便立即回转,每天晚间两灯同时开启不停交叉照射巡视.设灯P转动的速度是10度/秒,灯Q转动的速度是4度/秒,湖面上点M是音乐喷泉的中心.
(1)若把灯P自
转至
,或者灯Q自
转至
称为照射一次,请求出P、Q两灯照射一次各需要的时间;
(2)12秒时,两光束恰好在M点汇聚,求
的度数;
(3)在两灯同时开启,请问开启多长时间时,两灯的光束将第一次互相垂直 ?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffae4967934f87db831c3ec24b1d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/cbb72ab3-1a31-40ca-8f97-29d860af7250.png?resizew=271)
(1)若把灯P自
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
(2)12秒时,两光束恰好在M点汇聚,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b537d1ae7648cdeebb5adf19721356d.png)
(3)在两灯同时开启,请问开启多长时间时,两灯的光束将
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,D是
边上不与A,B重合的一个定点.
于点O,交
于点E.
是由线段
绕点D顺时针旋转
得到的,
的延长线相交于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/bf1fc94b-5052-4abb-9b4e-9d597ad9ef8b.jpg?resizew=126)
(1)求证:
;
(2)求
的度数;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bb2d945b7908ebac080e6595d4895f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce048b0f4d731bef4538bcb9e91da9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/bf1fc94b-5052-4abb-9b4e-9d597ad9ef8b.jpg?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c954c48ab8253ffcbfc58833b3ce0499.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在△ABC中,∠C=90°,AC=BC=6.点P在边AC上运动,过点P作PD⊥AB于点D,以AP、AD为邻边作▱PADE.设□PADE与△ABC重叠部分图形的面积为y,线段AP的长为x(0<x≤6).
(1)求线段PE的长(用含x的代数式表示).
(2)当点E落在边BC上时,求x的值.
(3)求y与x之间的函数关系式.
(4)直接写出点E到△ABC任意两边所在直线距离相等时x的值.
(1)求线段PE的长(用含x的代数式表示).
(2)当点E落在边BC上时,求x的值.
(3)求y与x之间的函数关系式.
(4)直接写出点E到△ABC任意两边所在直线距离相等时x的值.
![](https://img.xkw.com/dksih/QBM/2018/9/6/2026304586874880/2028220240093184/STEM/da49eceab54145bcb1dd4c44d377a017.png?resizew=174)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,
,点
是
边上一点,点
,
是
边上两点,且
,作点
关于
的对称点点
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/6f454ece-e5fc-48ab-b3a4-8b11ae76e47a.png?resizew=295)
(1)依题意补全图形;
(2)猜想
______°,并证明;
(3)猜想线段
、
、
的数量关系______,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b5d523373b8cbfa33e42a1bf154544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/6f454ece-e5fc-48ab-b3a4-8b11ae76e47a.png?resizew=295)
(1)依题意补全图形;
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064c359bafcd1841d582707419d1ac2d.png)
(3)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图.△ABC中.AB=BC=
.AC=4.D为AC的中点.E、F分别为AD、CD上的动点.过E作PE⊥AD.且DE+2PE=2.连接PF.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959391584788480/2959544363155456/STEM/7cd30624-98c0-4aae-a57c-40dba86abd3c.png?resizew=262)
(1)求sin∠C;
(2)连接AP.
①求证AP∥BC;
②请直接写出PF+
CF的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959391584788480/2959544363155456/STEM/7cd30624-98c0-4aae-a57c-40dba86abd3c.png?resizew=262)
(1)求sin∠C;
(2)连接AP.
①求证AP∥BC;
②请直接写出PF+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
您最近一年使用:0次