如图,在矩形ABCD中,AB=8,AD=6,P为射线AB上一个动点,过P作PF⊥AC,垂足为F,交CD于点G,连接CP与BF交于点H,过点C,P,F作⊙O.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/215f9fca-8f7d-48f6-99a3-420597eef1e0.png?resizew=182)
(1)当AP=5时,求证:∠CPB=∠FBC.
(2)当点P在线段AB上时,若△FCH的面积等于△PBH面积的4倍,求DG的长.
(3)当⊙O与△ADC的其中一边相切时,求所有满足条件的AP的长.
(4)当H将线段CP分成1:4的两部分时,求AP的长(直接写出结果).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/215f9fca-8f7d-48f6-99a3-420597eef1e0.png?resizew=182)
(1)当AP=5时,求证:∠CPB=∠FBC.
(2)当点P在线段AB上时,若△FCH的面积等于△PBH面积的4倍,求DG的长.
(3)当⊙O与△ADC的其中一边相切时,求所有满足条件的AP的长.
(4)当H将线段CP分成1:4的两部分时,求AP的长(直接写出结果).
更新时间:2020-05-17 08:09:06
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,梯形
中,
,
,点
是
延长线上一点,
,
,
垂直于射线
,垂足为点
.
(1)证朋:四边形
是平行四边形
(2)联结
,如果
是等腰三角形,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9f07a876244afec67a0eca4d45c2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604f9bbc0657e96ecf3f2e6f47a3c3f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/c68a84ae-2d29-4d32-9a68-cb726504fc77.png?resizew=187)
(1)证朋:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79c5041878c15de69253ca11a03ab1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】(Ⅰ)求证:平行四边形
的对角线长的平方和等于四条边长的平方和.即
.
(Ⅱ)平面内三个动点
满足
,且
到定点
的距离分别为
.求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d19e1fe90cccccbacb99b2fa94ae25b.png)
(Ⅱ)平面内三个动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab90f04b5141768433337dd9e991e80f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
解题方法
【推荐1】如图①,线段
,
交于点
,连结
和
,若
与
,
与
中有一组内错角成两倍关系,则称
与
为倍优三角形,其中成两倍关系的内错角中,较大的角称为倍优角.
(1)如图②,在四边形
中,对角线
,
交于点
,已知
,
为等边三角形.求证:
,
为倍优三角形.
(2)如图③,已知边长为2的正方形
,点
为边
上一动点(不与点
,
重合),连结
和
,对角线
和
交于点
,当
和
为倍优三角形时,求
的正切值.
(3)如图④,四边形
内接于⊙O,
和
是倍优三角形,且
为倍优角,延长
,
交于点
.
①若
,
,求⊙O的半径;
②记
的面积为
,
的面积为
,
,
,当
时,求
关于
的函数表达式.
![](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/1dde8112e8eb968fd042418dd632759e.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/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
(1)如图②,在四边形
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
(2)如图③,已知边长为2的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea98cd15fa4c868eb83ca260c6d9ae6.png)
(3)如图④,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c562f35d37deaa855e69d6616a6dc801.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
②记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e266f1f00b25c1fad57a3e3fd179a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaf31d3dad3de5a3eefd225a76e850d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd3b3822c0e887d6cd6c7f5b3d0eb0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2021/5/14/2720973125050368/2722504076574720/STEM/192c16e8-cccc-4ef5-afe3-b88486990757.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,抛物线
与x轴交于
,B两点,与y轴正半轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/827b68fb-f138-4704-9115-f1bb7e322b70.png?resizew=361)
(1)求抛物线的解析式;
(2)如图1,点P为直线
上方抛物线上一点,
,垂足为Q,若
,求点P的坐标.
(3)点M为射线
上一点,将
绕点M旋转得到
,若直线
恰好经过
,且
,请直接写出此时直线
与抛物线交点的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd4da08956db1f206c8ea026f4e52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/827b68fb-f138-4704-9115-f1bb7e322b70.png?resizew=361)
(1)求抛物线的解析式;
(2)如图1,点P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b154270249b0ef54ddb26137b2681a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58eb073ad0fd09054a4d629206712a25.png)
(3)点M为射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b118de3f8b180d795e2011097ac99518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d72d89238cb16d8301b193b61eb19b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6999cf658896c49fe8e483c47708be01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b45582debbc6b3a68761e2dcaea3ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aac694a5833952a576ff5173ff29fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐3】综合与实践
问题情境:
在综合与实践课上,老师让同学们以“等腰三角形的剪拼”为主题开展数学活动.如图1,在△ABC中,AB=AC=10cm,BC=16cm.将△ABC沿BC边上的中线AD剪开,得到△ABD和△ACD.
操作发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5459cbd6-38fd-4b2e-8c9b-68463ac0756b.png?resizew=464)
(1)乐学小组将图1中的△ACD以点D为旋转中心,按逆时针方向旋转,使得A'C'⊥AD,得到图2,A'C'与AB交于点E,则四边形BEC'D的形状是 .
(2)缜密小组将图1中的△ACD沿DB方向平移,A'D'与AB交于点M,A'C'与AD交于点N,得到图3,判断四边形MNDD'的形状,并说明理由.
实践探究:
(3)缜密小组又发现,当(2)中线段DD'的长为acm时,图3中的四边形MNDD'会成为正方形,求a的值.
(4)创新小组又把图1中的△ACD放到如图4所示的位置,点A的对应点A'与点D重合,点D的对应点D'在BD的延长线上,再将△A'C'D'绕点D逆时针旋转到如图5所示的位置,DD'交AB于点P,DC'交AB于点Q,DP=DQ,此时线段AP的长是 cm.
问题情境:
在综合与实践课上,老师让同学们以“等腰三角形的剪拼”为主题开展数学活动.如图1,在△ABC中,AB=AC=10cm,BC=16cm.将△ABC沿BC边上的中线AD剪开,得到△ABD和△ACD.
操作发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5459cbd6-38fd-4b2e-8c9b-68463ac0756b.png?resizew=464)
(1)乐学小组将图1中的△ACD以点D为旋转中心,按逆时针方向旋转,使得A'C'⊥AD,得到图2,A'C'与AB交于点E,则四边形BEC'D的形状是 .
(2)缜密小组将图1中的△ACD沿DB方向平移,A'D'与AB交于点M,A'C'与AD交于点N,得到图3,判断四边形MNDD'的形状,并说明理由.
实践探究:
(3)缜密小组又发现,当(2)中线段DD'的长为acm时,图3中的四边形MNDD'会成为正方形,求a的值.
(4)创新小组又把图1中的△ACD放到如图4所示的位置,点A的对应点A'与点D重合,点D的对应点D'在BD的延长线上,再将△A'C'D'绕点D逆时针旋转到如图5所示的位置,DD'交AB于点P,DC'交AB于点Q,DP=DQ,此时线段AP的长是 cm.
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
解题方法
【推荐1】(1)
和
是两个等腰直角三角形,如图1,其中
,连接
、
,求证:
≌
.
![](https://img.xkw.com/dksih/QBM/2020/11/17/2595086691737600/2595790996520960/STEM/8bb36027d9e64b6d97484a930ba27590.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2595086691737600/2595790996520960/STEM/ee8e730886804f24a5501f31610e7712.png?resizew=159)
(2)
和
是两个含30°的直角三角形,中
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033968c7f033a066499e75696a7bae5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
,
,
从边
与
重合开始绕点
逆时针旋转一定角度
.
①如图2,
与
交于点
,交
于
,连接
,若四边形
为平行四边形,求
的值.
②若
,当点
落在
上时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.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/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2595086691737600/2595790996520960/STEM/8bb36027d9e64b6d97484a930ba27590.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2595086691737600/2595790996520960/STEM/ee8e730886804f24a5501f31610e7712.png?resizew=159)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033968c7f033a066499e75696a7bae5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe405c5b31ac1a299dcf9ebf1c48ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf77f40ec1ecbf6939675358380fae2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
①如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e65831c1e6103af4c0bb4a4a61b964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16c261390402b9e483dc83da4157c64.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】在如图的
中,
,
,
,
平分
交
于点D,点E为
边上一点,点F为直线
上一点,连接
.将线段
绕点E顺时针旋转
得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/201eb70f-9a2b-4757-856a-d25c11e1a645.png?resizew=436)
(1)如图①,当点E与点C重合,且
的延长线过
边的中点G时,连接
,求线段
的长;
(2)如图②,点E不与点A,C重合,
的延长线交
边于点G,求证:
;
(3)如图③,E为线段
上一动点,F为
的中点,连接
,Q为
上一动点,连接
,将
沿
翻折至
所在的平面内,得到
,连接
,直接写出线段
长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/201eb70f-9a2b-4757-856a-d25c11e1a645.png?resizew=436)
(1)如图①,当点E与点C重合,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
(2)如图②,点E不与点A,C重合,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2489e08d20833b41c025a4921bab82c6.png)
(3)如图③,E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128638e48e657f8347943f8aae79545a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8effde11460db5ed8c970598cccc2b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c10cd9fe2cec68681f6246f23420f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c10cd9fe2cec68681f6246f23420f2.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】如图1,抛物线
的顶点为M,平行于x的直线与抛物线交于点A,B,若
为等腰直角三角形,则抛物线上A,B两点之间的部分与线段AB围成的图形称为该抛物线对应的“准碗形”,记为“准碗形AMB” .顶点M称为碗顶,线段AB称为碗宽,点M到线段AB的距离称为碗高.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896990125031424/2899959025156096/STEM/f7e2674c-1bd1-4ca8-a25a-7d05bd9006c8.png?resizew=375)
(1)抛物线
对应的碗宽为______;
(2)抛物线
对应的碗宽为______,抛物线
对应的碗高为______;
(3)已知抛物线
对应的碗高为3.
①求碗顶M的坐标;
②如图2,将“准碗形AMB” 绕点M顺时针旋转30°得到“准碗形
” .过点
作x轴的平行线交准碗形
于点C,点P是线段
上的动点,过点P作y轴的平行线交准碗形
于点Q.请直接写出线段PQ长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896990125031424/2899959025156096/STEM/f7e2674c-1bd1-4ca8-a25a-7d05bd9006c8.png?resizew=375)
(1)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
(2)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45848d377cad2507fe6846d0882005e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222c9b6fa02f4591055a242a53bb7bf.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754b8b4af08f82672f87796d3e42b341.png)
①求碗顶M的坐标;
②如图2,将“准碗形AMB” 绕点M顺时针旋转30°得到“准碗形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42621a2c8648632dbd3b0ce3a35eccc2.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图,在矩形
中,
,
,E是
上一点,且
.动点P从点B出发,沿
方向以每秒3个单位的速度向点C运动,过点P作
交
于点F,过点F作
交
于点G,连结
.当点F与点A重合时,点P停止运动,设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815117447168/2960710504947712/STEM/0107dbe2-6d41-4945-8225-b49215525d6b.png?resizew=176)
(1)求
的长(用含t的代数式表示);
(2)当点P在何处时,
的面积最大?最大面积是多少?
(3)作
的外接圆
,在点P的运动过程中,是否存在实数t,使
与四边形
的一边(
边除外)相切?若存在,直接写出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/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cfd06fbb5ceab1ec9b8385cd14a9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897815117447168/2960710504947712/STEM/0107dbe2-6d41-4945-8225-b49215525d6b.png?resizew=176)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)当点P在何处时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a8ceee5fa19abfde9173aac721b35b.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb59ba8382f1463050d408191e131c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图1,将半径为2的
剪掉一个
的扇形之后,得到扇形AOB,将扇形AOB放置在数轴上,使点B与原点重合且OB垂直于数轴,然后将图形沿数轴正方向滚动,直至点A落在数轴上时停止滚动.记优弧AB与数轴的切点为点P,过点A作直线l平行于数轴,当l与弧AB有两个公共点时,记另一个公共点为点C,将直线l绕点C顺时针旋转
,得到直线m,交数轴于点Q.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986936580505600/2992490825023488/STEM/0a49452a-33bd-4d8a-bcf9-5e34b06b1b53.png?resizew=558)
(1)当点A落在数轴上时,其对应数轴上的实数为___________;
(2)当直线l经过圆心O时,线段PQ的长度为___________;
(3)当CQ与扇形AOB所在圆相切于圆的左侧时,求弦AC的长及点Q对应数轴上的实数;
(4)直接写出整个运动过程中PQ长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986936580505600/2992490825023488/STEM/0a49452a-33bd-4d8a-bcf9-5e34b06b1b53.png?resizew=558)
(1)当点A落在数轴上时,其对应数轴上的实数为___________;
(2)当直线l经过圆心O时,线段PQ的长度为___________;
(3)当CQ与扇形AOB所在圆相切于圆的左侧时,求弦AC的长及点Q对应数轴上的实数;
(4)直接写出整个运动过程中PQ长度的最大值.
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】(1)【学习心得】
于彤同学在学习完“圆”这一章内容后,感觉到一些几何问题如果添加辅助圆,运用圆的知识解决,可以使问题变得非常容易.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/4db8cd8f-ee0d-42cc-b2a4-88595bb1d2e7.png?resizew=504)
例如:如图1,在△ABC中,AB=AC,∠BAC=90°,D是△ABC外一点,且AD=AC,求∠BDC的度数.若以点A为圆心,AB为半径作辅助⊙A,则点C、D必在⊙A上,∠BAC是⊙A的圆心角,而∠BDC是圆周角,从而可容易得到∠BDC= °.
(2)【问题解决】
如图2,在四边形ABCD中,∠BAD=∠BCD=90°,∠BDC=25°,求∠BAC的度数.
(3)【问题拓展】
如图3,如图,E,F是正方形ABCD的边AD上两个动点,满足AE=DF.连接CF交BD于点G,连接BE交AG于点H.若正方形的边长为2,则线段DH长度的最小值是 .
于彤同学在学习完“圆”这一章内容后,感觉到一些几何问题如果添加辅助圆,运用圆的知识解决,可以使问题变得非常容易.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/4db8cd8f-ee0d-42cc-b2a4-88595bb1d2e7.png?resizew=504)
例如:如图1,在△ABC中,AB=AC,∠BAC=90°,D是△ABC外一点,且AD=AC,求∠BDC的度数.若以点A为圆心,AB为半径作辅助⊙A,则点C、D必在⊙A上,∠BAC是⊙A的圆心角,而∠BDC是圆周角,从而可容易得到∠BDC= °.
(2)【问题解决】
如图2,在四边形ABCD中,∠BAD=∠BCD=90°,∠BDC=25°,求∠BAC的度数.
(3)【问题拓展】
如图3,如图,E,F是正方形ABCD的边AD上两个动点,满足AE=DF.连接CF交BD于点G,连接BE交AG于点H.若正方形的边长为2,则线段DH长度的最小值是 .
您最近一年使用:0次