综合与实践
素材:一张边长为4的正方形纸片
步骤1:对折正方形纸片
,使
与
重合,得到折痕
,把纸片展平.
步骤2:再一次折叠纸片,点A落在点G处,并使折痕经过点E,得到折痕
,点
在边
上,过点
作
的垂线交射线
于点
.
落在边
上,直接写出
的度数;
(2)如图2, 设
,
, 试求y关于x的函数表达式;
(3)如图3,
为
的外接圆,若
与边
相切,求
的长.
素材:一张边长为4的正方形纸片
步骤1:对折正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/49b50357a6545cae8348e3059312f520.png)
步骤2:再一次折叠纸片,点A落在点G处,并使折痕经过点E,得到折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcf0b442d5ff2ce8efa1a778b4ecd6.png)
(2)如图2, 设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9a1962f7c0143fef5d3e98075e852a.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
更新时间:2024-05-26 14:25:52
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,
,动点
从点
出发,沿折线
向点
运动,点
在
上的速度为每秒1个单位长度,在
上的速度为每秒
个单位长度,过点
作
交折线
于点
,以点
为旋转点,将线段
绕点
顺时针旋转
得到线段
,连接
.当
与
重叠部分图形是三角形时,设三角形的面积为
(平方单位),点
的运动时间为
(秒).
(1)当
时,求
的长.
(2)求
关于
的函数解析式.
(3)当
与
重叠部分图形是轴对称图形时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d768ffd5bf75080e8ff5ce6b472c0cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778cdfe7346279f9695a745fb780e806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f602a637e57761b115810931ae8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/1/de4e58b9-da32-4b7c-9a86-a5b5b8572820.png?resizew=170)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,抛物线,
(m> l)与y轴正半轴交于点A,对称轴与x轴交于点B,C为对称轴上的点,且AC⊥BC.将△ABC绕B点沿顺时针方向旋转90°得到△DBE, D点恰好在抛物线上.
(1)求m的值.
(2)连EC交y轴于F,连DF, AE,试判断四边形AEDF的形状,并予以证明.
(3)M为y轴上的点,N为抛物线上的点,是否存在这样的M, N点,使四边形ABMN为矩形?若存在,求出M点,N点的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f464e5a136ae33c6604a913d00e016.png)
(1)求m的值.
(2)连EC交y轴于F,连DF, AE,试判断四边形AEDF的形状,并予以证明.
(3)M为y轴上的点,N为抛物线上的点,是否存在这样的M, N点,使四边形ABMN为矩形?若存在,求出M点,N点的坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/5/14/2203414963486720/2209229615628288/STEM/6ab3c4bbdfcb4204a846b9df0a6958fd.png?resizew=216)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】已知正方形ABCD的边长为8,点E为BC的中点,连接AE,并延长交射线DC于点F,将
ABE沿着直线AE翻折,点B落在B′处,延长AB′,交直线CD于点M.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/0b050cd2-98b0-41ad-85ff-84ea7163a5ab.png?resizew=393)
(1)判断
AMF的形状并证明;
(2)将正方形变为矩形ABCD,且AB=6,BC=8,若B′恰好落在对角线AC上时,得到图2,此时CF= ,
= ;
(3)在(2)的条件下,点E在BC边上.设BE为x,
ABE沿直线AE翻折后与矩形ABCD重合的面积为y,求y与x之间的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/0b050cd2-98b0-41ad-85ff-84ea7163a5ab.png?resizew=393)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)将正方形变为矩形ABCD,且AB=6,BC=8,若B′恰好落在对角线AC上时,得到图2,此时CF= ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
(3)在(2)的条件下,点E在BC边上.设BE为x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】综合与实践课上,刘老师让同学们以“矩形的折叠”为主题开展数学活动.
操作一:对折矩形纸片
,使
与
重合,得到折痕
,把纸片展平;
操作二:在
上选一点
,沿
折叠,使点
落在矩形内部点
处,把纸片展平,连接
,
.
根据以上操作,当点
在
上时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87991d844f9535c970d916e88f6f6687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e1318d014f1911f1259a19c7b50b8b.png)
(2)迁移探究
爱动脑的小明同学将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片
按照(1)中的方式操作,并延长
交
于点
,连接
.
①如图2,当点
在
上时,
;
②改变点
在
上的位置(点
不与点
,
重合),如图3,判断
的度数,并说明理由.
(3)拓展应用
在(2)的探究中,已知正方形纸片
的边长为
,当
时,直接写出
的长.
操作一:对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
根据以上操作,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87991d844f9535c970d916e88f6f6687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e1318d014f1911f1259a19c7b50b8b.png)
(2)迁移探究
爱动脑的小明同学将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
①如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b782f7763233865373b80b266223817f.png)
②改变点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
(3)拓展应用
在(2)的探究中,已知正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18d012a26bb4f9283a64b02d9ee110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐3】如图,将
纸片沿中位线
折叠,使点
的对称点
落在
边上,再将纸片分别沿等腰
和等腰
的底边上的高线
折叠,折叠后的三个三角形拼合形成一个矩形.类似地,对多边形进行折叠,若翻折后的图形恰能拼成一个无缝隙、无重叠的矩形,这样的矩形称为叠合矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/dcb90a87-ed74-4786-a0ab-7dbce4d401f4.png?resizew=628)
(1)将
纸片按图
的方式折叠成一个叠合矩形
,则操作形成的折痕分别是线段________,________;
________.
(2)
纸片还可以按图
的方式折叠成一个叠合矩形
,若
,求
的长.
(3)如图
,四边形
纸片满足
,
,
,
,
小明把该纸片折叠,得到叠合正方形.请你帮助画出叠合正方形的示意图,并求出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2051742fa22ebe2c63538e2fb447dcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c187153099c5b013159a3987a0c61fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/dcb90a87-ed74-4786-a0ab-7dbce4d401f4.png?resizew=628)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc840e197de2dabff676ee1b8968fada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bcdae67b4b44d587a486e8c44562c03.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ddf5b63434d35a46496c20c27aae9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4652f95f3a388706906bc85f53f8db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c7c5650b3f88b8453b43c28a6f1a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,现有一张边长为2的正方形纸片
,P为正方形的边
上的一点(不与点A,D重合),将正方形纸片
折叠,使点B落在点P处,点C落在点G处,
交
于点H,折痕为EF,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/0b938bd7-a800-45fd-ab52-eab47fcd15c2.png?resizew=160)
(1)求证:
(2)当点P在边
上移动时,
的度数是否发生变化?请判断并证明你的结论.
(3)当点P在边
上移动时,
的周长是否发生变化?若不变,请直接写出答案.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/0b938bd7-a800-45fd-ab52-eab47fcd15c2.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff016d75bc158fdb57bba336f7c8c34.png)
(2)当点P在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20886e55a54a04670f23480e2138ce39.png)
(3)当点P在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a15bd57e58328a9d2a8662d803addc.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,取一张矩形的纸片进行折叠,具体操作过程如下:
第一步:如图1,对折矩形纸片
,使
与
重合,折痕为
,把纸片展平;
第二步:在
上选一点P,沿
折叠纸片,使点A落在矩形内部的点M处,连接
.根据以上操作,当点M在
上时,
____________
;
(2)【类比应用】
如图2,小李将矩形纸片换成边长为
的正方形纸片,继续探究,过程如下:将正方形纸片
按照(1)中的方式操作,并延长
交
于点Q,连接
,当点M在
上时,求
的度数;
(3)【拓展延伸】
如图3,在(2)的探究中,改变点P在
上的位置(点P不与点
重合),当
时,请直接写出
的长.
第一步:如图1,对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
第二步:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567bcf2f9acc3145ab479ee5ec7c7f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f72774fae5cd1adf2967b8481ac4e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)【类比应用】
如图2,小李将矩形纸片换成边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cd4848ce65d25d3bb30a725322ca8f.png)
(3)【拓展延伸】
如图3,在(2)的探究中,改变点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2687c688b28716066ff9120f8e5ccbce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知:对于平面直角坐标系
中的点P和
的半径为4,交x轴于点A,B,对于点P给出如下定义:过点C 的直线与
交于点M,N,点P为线段
的中点,我们把这样的点P叫做关于
的“折弦点”.
(1)若
.
①点
中是关于
的“折弦点”的是 ;
②若直线
上只存在一个关于
的“折弦点”,求k的值;
(2)点C在线段
上,直线
上存在关于
的“折弦点”,直接写出b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42cea87df0ec2db79f3b21a0d49d0a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/a96e9384-8c44-4b1f-b8b1-653bac0f7359.png?resizew=552)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761664be69e3a89714acae64ce2394c.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f842b8b183bc04ef6843baeffe41aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c743b2aa9ad595b62c01508c7e6c58a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)点C在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在⊙O中,
,BD交OC于点F,EB是⊙O的切线,交OA的延长线于点E,EF交OB于点G,连接BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/b27ffb30-020f-4e00-b638-fcf231fc66ba.png?resizew=175)
(1)求证:△OBE∽△OFB.
(2)设∠CBD=x度,∠OEB=y度,求x,y之间的数量关系.
(3)若OB=4,且OE平行△BCF的一边时,求出所有满足条件的EF的长.
(4)若OG=BG,直接写出此时sin∠OBF的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc6acc2e933101a028091cf0b2500a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/b27ffb30-020f-4e00-b638-fcf231fc66ba.png?resizew=175)
(1)求证:△OBE∽△OFB.
(2)设∠CBD=x度,∠OEB=y度,求x,y之间的数量关系.
(3)若OB=4,且OE平行△BCF的一边时,求出所有满足条件的EF的长.
(4)若OG=BG,直接写出此时sin∠OBF的值.
您最近一年使用:0次