如图,在
中,
,点
从点
出发,沿折线
以
速度向点
运动,同时点
从点
出发,沿
方向以
的速度向点
运动,点
到达点
时,点
同时停止运动,当点
不与
重合时,作点
关于直线
的对称点
,连接
交
于点
,连接
.设运动时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/e29cb348-cd4c-4155-8763-9444d902b411.png?resizew=307)
备用图
(1)当
为何值时,
?
(2)设
的面积为
,求
与
的函数关系式并写出
的取值范围;
(3)当
为何值时,
为直角三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f69a5639d61458a47525abfd0d7db975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722b4403b1cd40188f0bfd1098ec9095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3cbffc1b0e4edc7af30ba0a005aee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468848d6778ba56ef340bde4ff84834d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8099d4dc4711272b73d18d963eb47518.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/e29cb348-cd4c-4155-8763-9444d902b411.png?resizew=307)
备用图
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec89da265546bbe3e4fee52aaba96ae.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
更新时间:2024-02-20 22:09:15
|
相似题推荐
解答题-问答题
|
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(0.4)
名校
【推荐1】如图,在△ABC中,∠BAC=110°,分别交AB、BC于点D、E.MN垂直平分AC,分别交AC、BC于点M、N.连接AE、AN.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912608619413504/2913665671610368/STEM/ae708c2a-a3ef-4c38-871c-bb9233b7e7dd.png?resizew=166)
(1)求∠EAN的度数;
(2)若△AEN的周长为15,则BC的长为 .
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912608619413504/2913665671610368/STEM/ae708c2a-a3ef-4c38-871c-bb9233b7e7dd.png?resizew=166)
(1)求∠EAN的度数;
(2)若△AEN的周长为15,则BC的长为 .
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【推荐2】如图,点P是菱形
的对角线
上一点,连接
并延长,交
于E,交
的延长线于F.
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234829506076672/3237679486181376/STEM/2f30c23403f34537a3dfa69e6753832f.png?resizew=191)
(1)求证:
;
(2)若
,
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234829506076672/3237679486181376/STEM/2f30c23403f34537a3dfa69e6753832f.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb350cb6e6764d2fa68f6c4229c24d34.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6019c68de63a11bc002c13bbb7614eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fdb0bc180828ca206181c92c6bcb11e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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【推荐3】《见微知著》读到:从一个简单的经典问题出发,从特殊到一般,由简单到复杂:从部分到整体,由低维到高维,知识与方法上的类比是探索发展重要途径,是思想阀门发现新问题、结论的重要方法(教材呈现),图中是华师版九年级上册数学教材第103﹣104页的部分内容.
(1)定理证明:请根据教材图24﹣2.2的提示,结合图①完成直角三角形的性质:“直角三角形斜边上的中线等于斜边的一半”的证明
(2)定理应用:如图②,在
ABC中,AD⊥BC,垂足为点D(点D在BC上),CE是AB边的中线,DG垂直平分CE,求证:∠B=2∠BCE.
(3)拓展提高:如图③,在
ABC中,∠B=30,∠ADC=45,AD恰好是中线,求∠C的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/8a963e9c-2482-4a69-a72d-721e0c539165.png?resizew=475)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/5b40c03c-96b3-45e3-bfd2-0cf9ad4add22.png?resizew=379)
(1)定理证明:请根据教材图24﹣2.2的提示,结合图①完成直角三角形的性质:“直角三角形斜边上的中线等于斜边的一半”的证明
(2)定理应用:如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)拓展提高:如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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解题方法
【推荐1】如图,在
中,
,点D为斜边
上一点,连接
,将
绕点C顺时针旋转
,得到
,连接
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/cce14c21-e639-4842-95fc-5b5a366a0dd6.png?resizew=409)
(1)如图1,若
,
,D为
的中点,求
的长度.
(2)如图2,
于点D,G为
边上一点,且
,求证:
.
(3)如图3,若
,
,当
为等腰三角形时,直接写出
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/cce14c21-e639-4842-95fc-5b5a366a0dd6.png?resizew=409)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce01742c1d5881b2279d7b39d5a86d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8daff96303a07819bd4ee47731e73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3594d11decd0a518da5610042b1b953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c382bb6967ef2ff0f5ef04fc05b9cabd.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce01742c1d5881b2279d7b39d5a86d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
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【推荐2】在等腰
中,
.动点M、N分别在两腰
上(M不与A、B重合,N不与A、C重合),且
.将
沿
所在的直线折叠,使点A的对应点为P.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/ef838c41-6f20-4111-9d98-235b65023a5b.png?resizew=164)
(1)当
为何值时,点P恰好落在
上?
(2)当
与等腰
重叠部分的面积为y,试写出y与x的函数关系式.当x为何值时,y的值最大,最大值是多少?
(3)当
时,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ed37e2f1484ae6d7c413a0d0c69f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1dc52a8ba9f389800eb92dbd145bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/ef838c41-6f20-4111-9d98-235b65023a5b.png?resizew=164)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eaa9636266ceb41b43ef85bd03d3541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc477b9b8788f44f04d2fefbfaa5b3a.png)
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【推荐3】【问题初探】
在数学活动课上,王老师给出如下问题:如图
,正方形
中,点
是线段
上一点(不与点
、
重合),连接
.将
绕点
顺时针旋转
得到
,连接
,求
的度数.
①小聪同学给出如下解题思路:过点
作
交
的延长线于点
,得到
与
的数量关系,进而求出
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/61b8a311-a0fe-4128-adeb-44154710eca4.png?resizew=148)
②小慧同学给出另一种解题思路:在
上截取
,使得
,连接
,得到
与
之间的数量关系,进而求出
的度数.
请你选择一名同学的解题思路,写出证明过程.
【类比分析】
王老师发现之前两名同学都根据图形的特点运用了构造全等的方法,体现了转化的数学思想;为了帮助学生更好地发现数学直觉,感悟转化思想,培养几何直观,王老师将图
进行变换并提出了下面问题,请你解答.
如图
,菱形
中,
,点
是线段
上一点(不与点
、
重合),连接
,将
绕点
顺时针旋转
得到
,连接
,探究
与
的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b7452f9f-e463-4d93-8b3f-1e6c2e0633aa.png?resizew=163)
【学以致用】
如图
,在
中,
,
,
,
为
上一点,满足
.
为
延长线上一点,
,
与
延长线交于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307e785b90bb03f946e84f4c06e45d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fc8bfdbf2a7e4ab5ef262b20611785.png)
①小聪同学给出如下解题思路:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fc8bfdbf2a7e4ab5ef262b20611785.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/61b8a311-a0fe-4128-adeb-44154710eca4.png?resizew=148)
②小慧同学给出另一种解题思路:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7f8da1f66714eba7f2867a19d02479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fc8bfdbf2a7e4ab5ef262b20611785.png)
请你选择一名同学的解题思路,写出证明过程.
【类比分析】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39adf871a542f06d911a891a75bab53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fc8bfdbf2a7e4ab5ef262b20611785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b7452f9f-e463-4d93-8b3f-1e6c2e0633aa.png?resizew=163)
【学以致用】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd056bf480a04dafb4b6da24662cc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1748064cf09e888d16f961d7dbea29ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/cb84d5ed-5a72-4e87-904e-ad8d0bd3ee64.png?resizew=144)
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【推荐1】如图,正方形ABCD和正方形OPEF中,边AD与边OP重合,
,
,点M、N分别在正方形ABCD的边BC、CD上,且
.将正方形OPEF以每秒2个单位的速度向右平移,当点F与点B重合时,停止平移.设平移时间为t秒.
(1)请求出t的取值范围;
(2)猜想:正方形OPEF的平移过程中,OE与NM的位置关系.并说明理由.
(3)连结DE、BE.当
的面积等于7时,试求出正方形OPEF的平移时间t的值.
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268663442055168/2269385667960832/STEM/cb2f3308c14e4ad798c3e5b65e71f7ae.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268663442055168/2269385667960832/STEM/aa7c664319fd456488cd85ee003d67d7.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89182ee8cb1de919ee6ebdf93e9cff40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489cbfa4bc53491303ef5c91ae9b6508.png)
(1)请求出t的取值范围;
(2)猜想:正方形OPEF的平移过程中,OE与NM的位置关系.并说明理由.
(3)连结DE、BE.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268663442055168/2269385667960832/STEM/cb2f3308c14e4ad798c3e5b65e71f7ae.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2019/8/14/2268663442055168/2269385667960832/STEM/aa7c664319fd456488cd85ee003d67d7.png?resizew=126)
备用图
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解题方法
【推荐2】如图,在平面直角坐标系中,点M的坐标是(-2,
),⊙M与y轴相切于点C,与x轴相交于A,B两点.
(1)证明:△MAB是等边三角形.
(2)在⊙M上是否存在点D,使△ACD是直角三角形,若存在,试求点D的坐标;若不存在,请说明理由.
(3)若P(m,n)是过A,B,C三点的抛物线上一点,当∠APB≤30°时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)证明:△MAB是等边三角形.
(2)在⊙M上是否存在点D,使△ACD是直角三角形,若存在,试求点D的坐标;若不存在,请说明理由.
(3)若P(m,n)是过A,B,C三点的抛物线上一点,当∠APB≤30°时,直接写出m的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/e72cca81-5443-41fd-b21d-de18e457e9c6.jpg?resizew=309)
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【推荐3】【问题背景】数学兴趣小组利用两块大小不同的正方形卡片进行“正方形旋转”的探究活动.如图1,他们将边长为4的正方形
与边长为2的正方形
的一个顶点重合于点B,使边
,
分别落在边
,
上.容易发现
且
.
固定,将正方形
绕点B顺时针方向旋转
(
).
(1)如图2,连接
,
,试探究
与
的上述关系是否仍然成立?若成立,请给予证明;若不成立,请说明理由.
(2)小组研究发现:如图3,连接
,在旋转过程中,存在
与
全等的情形,请直接写出此时旋转角α的度数 .
【问题拓展】将图1中正方形
固定,将正方形
绕点B顺时针方向旋转a(
).
(3)在旋转过程中,当A,G,E三点在同一条直线上时,求线段
的长;
(4)如图4,连接
,取
中点H,连接
,请直接写出线段
长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76956e451ab7fd18f473503c3745187d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6813488bd1ea40a3aa5e2cb3be7bf312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7591d7a8b899be0aec7f9bf350b4ab.png)
(1)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)小组研究发现:如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
【问题拓展】将图1中正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7591d7a8b899be0aec7f9bf350b4ab.png)
(3)在旋转过程中,当A,G,E三点在同一条直线上时,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(4)如图4,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
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【推荐1】如图乙,△ABC 和△ADE 是有公共顶点的等腰直角三角形,∠BAC=∠DAE=90°,点P为射线 BD,CE的交点.
(1)如图甲,将△ADE 绕点A 旋转,当 C、D、E 在同一条直线上时,连接BD、BE,则下列给出的四个结论中,其中正确的是哪几个.(回答直接写序号)
①BD=CE;②BD⊥CE;③∠ACE+∠DBC=45°;④BE2=2(AD2+AB2)
(2)若 AB=4,AD=2,把△ADE 绕点 A 旋转,
①当∠CAE=90°时,求 PB 的长;
②直接写出旋转过程中线段 PB 长的最大值.
(1)如图甲,将△ADE 绕点A 旋转,当 C、D、E 在同一条直线上时,连接BD、BE,则下列给出的四个结论中,其中正确的是哪几个.(回答直接写序号)
①BD=CE;②BD⊥CE;③∠ACE+∠DBC=45°;④BE2=2(AD2+AB2)
(2)若 AB=4,AD=2,把△ADE 绕点 A 旋转,
①当∠CAE=90°时,求 PB 的长;
②直接写出旋转过程中线段 PB 长的最大值.
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096685660790784/2098171888271360/STEM/d3bc041f5353474cae40fa5bcb775530.png?resizew=445)
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【推荐2】如图,已知:在矩形
中,
,
,点P从点B出发,沿
方向匀速运动,速度为
;与点P同时,点Q从D点出发,沿
方向匀速运动,速度为
;过点Q作
,交DC于点E,设运动时间为
,
,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/7fa5d67b-4059-47e7-b221-1268a2103666.png?resizew=467)
(1)在运动过程中,是否存在某一时刻t,使
平分
?若存在,求出t的值;若不存在,请说明理由;
(2)设五边形
的面积为y,求y与t的函数关系式;
(3)是否存在某一时刻t,使
是直角三角形?若存在,求出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/b35ed92397da56c7afbd6967597a9611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9547f6b5c7c54d216ecea72becb7d373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477299ffa5ca3e4664b2cbae878f5f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c77f28566edddf4c3a8c15b3eee12a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/7fa5d67b-4059-47e7-b221-1268a2103666.png?resizew=467)
(1)在运动过程中,是否存在某一时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
(2)设五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773fab1afc7baa802bbc8302b338b890.png)
(3)是否存在某一时刻t,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5845d0b7ca6980eea65473c0de995de.png)
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