如图,E是四边形ABCD的边AB上一点.
![](https://img.xkw.com/dksih/QBM/2016/3/9/1573982354907136/1573982361018368/STEM/2507c3b1e698403eb43321324b336509.png)
(1)猜想论证:如图,分别连接DE、CE,若∠A=∠B=∠DEC=65°,试猜想图中哪两个三角形相似,并说明理由.
(2)观察作图:如图,在矩形ABCD中,AB=5,BC=2,且A,B,C,D四点均在正方形网格(网格中每个小正方形的边长为1)的格点(即每个小正方形的顶点)上,试在图中矩形ABCD的边AB上画出所有满足条件的点E(点E与点A,B 不重合),分别连结ED,EC,使四边形ABCD被分成的三个三角形相似(不证明).
(3)拓展探究:如图,将矩形ABCD沿CM折叠,使点D落在AB边上的点E处,若点E恰好将四边形ABCM分成的三个三角形相似,请直接写出
的值.
![](https://img.xkw.com/dksih/QBM/2016/3/9/1573982354907136/1573982361018368/STEM/2507c3b1e698403eb43321324b336509.png)
(1)猜想论证:如图,分别连接DE、CE,若∠A=∠B=∠DEC=65°,试猜想图中哪两个三角形相似,并说明理由.
(2)观察作图:如图,在矩形ABCD中,AB=5,BC=2,且A,B,C,D四点均在正方形网格(网格中每个小正方形的边长为1)的格点(即每个小正方形的顶点)上,试在图中矩形ABCD的边AB上画出所有满足条件的点E(点E与点A,B 不重合),分别连结ED,EC,使四边形ABCD被分成的三个三角形相似(不证明).
(3)拓展探究:如图,将矩形ABCD沿CM折叠,使点D落在AB边上的点E处,若点E恰好将四边形ABCM分成的三个三角形相似,请直接写出
![](https://img.xkw.com/dksih/QBM/2016/3/9/1573982354907136/1573982361018368/STEM/facf43029f12488ab8ca9d2946d11d37.png)
更新时间:2016-12-06 04:58:13
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【推荐1】如图,直线AB交x轴正半轴于点A(a,0),交y轴正半轴于点B(0,b),且a、b满足 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdee14bba7bd2030166d9a7eda379d91.png)
(1)求A、B两点的坐标;
(2)C为OA的中点,作点C关于y轴的对称点D,以BD为直角边在第二象限作等腰Rt△BDE,过点E作EF⊥x轴于点F.若直线y=kx-4k将四边形OBEF分为面积相等的两部分,求k的值;
(3)如图,P为x轴上A点右侧任意一点,以BP为边作等腰Rt△PBM,其中PB=PM,直线MA交y轴于点Q,当点P在x轴上运动时,线段OQ的长是否发生变化?若不变,求其值;若变化,求线段OQ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdee14bba7bd2030166d9a7eda379d91.png)
(1)求A、B两点的坐标;
(2)C为OA的中点,作点C关于y轴的对称点D,以BD为直角边在第二象限作等腰Rt△BDE,过点E作EF⊥x轴于点F.若直线y=kx-4k将四边形OBEF分为面积相等的两部分,求k的值;
(3)如图,P为x轴上A点右侧任意一点,以BP为边作等腰Rt△PBM,其中PB=PM,直线MA交y轴于点Q,当点P在x轴上运动时,线段OQ的长是否发生变化?若不变,求其值;若变化,求线段OQ的取值范围.
![](https://img.xkw.com/dksih/QBM/2017/8/25/1759569617657856/1759777222516736/STEM/fca6980d21ac40b9b03727ab3fd23ed9.png?resizew=373)
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【推荐2】如图①,在△ABC中,AB=12cm,BC=20cm,过点C作射线CD∥AB,点M从点B出发,以3cm/s的速度沿BC匀速移动;点N从点C出发,以acm/s的速度沿CD匀速移动.点M、N同时出发,当点M到达点C时,点M、N同时停止移动.连接AM、MN,设移动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/2d05cbd1-caa7-40e7-a5af-aef851681b7d.png?resizew=387)
(1)点M、N从移动开始到停止,所用时间为 s;
(2)当△ABM与△MCN全等时,
①若点M、N的移动速度相同,求t的值;
②若点M、N的移动速度不同,求a的值;
(3)如图②,当点M、N开始移动时,点P同时从点A出发,以2cm/s的速度沿AB向点B匀速移动,到达点B后立刻以原速度沿BA返回.当点M到达点C时,点M、N、P同时停止移动.在移动的过程中,是否存在△PBM与△MCN全等的情形?若存在,求出t的值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/2d05cbd1-caa7-40e7-a5af-aef851681b7d.png?resizew=387)
(1)点M、N从移动开始到停止,所用时间为 s;
(2)当△ABM与△MCN全等时,
①若点M、N的移动速度相同,求t的值;
②若点M、N的移动速度不同,求a的值;
(3)如图②,当点M、N开始移动时,点P同时从点A出发,以2cm/s的速度沿AB向点B匀速移动,到达点B后立刻以原速度沿BA返回.当点M到达点C时,点M、N、P同时停止移动.在移动的过程中,是否存在△PBM与△MCN全等的情形?若存在,求出t的值;若不存在,说明理由.
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【推荐1】已知点
在反比例函数
的图象上,以
为边长作正方形
,使正方形顶点
在
轴上方,
与
轴的夹角为
.
在
轴上时,求点
坐标;
(2)①如图2,当
时,
与
轴相交于点
,若
,求点
的坐标;
②如图3,当
时,
与
轴相交于点
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8b58020f4297dc52f1e082558bd745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.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/5963abe8f421bd99a2aaa94831a951e9.png)
(2)①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6406b4f25d9175b1a1bd9c739cb740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef966cdd137b3b10e290201b4d17542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df61e1f0cfc78a10741922d9dc43973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536e072eb0439a5e5b430cd55a129374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】如图,
为
的直径,点
、点
为
上异于
、
的两点,连接
,过点
作
,交
的延长线于点
,连接
、
、
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/08b70dbd-fb00-4ab1-a12c-83d053a050d0.png?resizew=161)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
的半径为
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a840273d05974a5de82d471ed417e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3dbbb7943be3d41a44b51e1ca3532c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/08b70dbd-fb00-4ab1-a12c-83d053a050d0.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ccbec9919012fe32eb04d4ca1a9499.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0987ffa9ff3ba70d0a9310d6cd31cbc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】如图,矩形
中,对角线
与
相交于点O,过O,C两点的
切线段
于点T,分别交线段
于点F,E,M,连结
,已知
.
;
(2)若M为
的中点,求
的半径;
(3)若
的半径为3,求
的值.
![](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/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6264f1f6d01bae13b770e66e5c23aabd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac7fe13057b6285b57362e69db5e192.png)
(2)若M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aabfc79990a19310387d998eb6d1339.png)
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【推荐2】如图,
为
的直径,点C为
上方
上一点,点D为
延长线上一点,连接
交
于点E,垂足为H,
交
于点F.
![](https://img.xkw.com/dksih/QBM/2024/1/21/3416151178838016/3416888618450944/STEM/7d767f64f29942f28d8337676d4f7d2a.png?resizew=181)
(1)求证:
.
(2)若
.
①若
,求
的长;
②若点A是线段
的中点,求此圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063a24738026ce513e41a77c7613d044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2024/1/21/3416151178838016/3416888618450944/STEM/7d767f64f29942f28d8337676d4f7d2a.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0372ab874b7a22402858bdbbf0f63b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4412034cce9d692dce486351e91db8c0.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba11eab8bdcc94bad06db5dbfd6948e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
②若点A是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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