1 . 在矩形
中,
,
,将矩形
绕点B顺时针旋转得到矩形
,A,C,D的对应点分别为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/cceb6687-6f54-4d6b-a030-114c1558e07b.png?resizew=604)
(1)当点
落在线段
上时,完成以下探究.
①如图1,求
的长.
②如图2,延长
交
于点E,求证:
.
(2)如图3,以
为斜边在右侧作等腰直角三角形
,
,
交
于点G,交
于点H,若
,求
的长.
(3)如图4,矩形
的对角线
与
相交于点P,连接
,
,则
面积的最小值为___.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e963c942be5c658864dee9bb352b36c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/cceb6687-6f54-4d6b-a030-114c1558e07b.png?resizew=604)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
①如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75d14708e6aa1404477db9d7e3166f0.png)
②如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bb645f59ab22e0716100d498c834b4.png)
(2)如图3,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22137ccddfe21639b4c02b24c62c73f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef669cf90972c6e6f7dda81a2facf4b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5b5d9bed01632b26ab881deab2afa.png)
(3)如图4,矩形
![](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/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79039b211d151710a15fc9dda11d6225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8be33504a6928671b97612ca15109ff.png)
您最近一年使用:0次
2023-03-24更新
|
444次组卷
|
5卷引用:2023年河北省保定市中考一模数学试题
2023年河北省保定市中考一模数学试题2023年河北省保定高新技术产业开发区中考一模数学试卷(已下线)2023年河北省保定市中考一模考试数学卷变式题21-26题(已下线)2023年河北中考数学一模几何综合题(已下线)专题16 与特殊四边形有关的证明计算-学易金卷:2023年中考数学一模试题分项汇编(全国通用)
2 . 如图1,将一个边长为2的正方形
和一个长为2,宽为1的矩形
拼在一起,构成一个大的矩形
现将小矩形
绕点C顺时针旋转至
,旋转角度为
,设直线
交直线
于点M,直线
交直线
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/e6be4f87-7f32-4a3b-89c4-5b97ed9f1d0d.png?resizew=714)
(1)如图2,当点
恰好落在
边上时,求旋转角
的值;
(2)在旋转过程中,
与
能否全等?若能,请直接写出满足条件的旋转角
的值;若不能,请简要说明理由.
(3)通过探究发现,随着旋转角
的变化,虽然
与
的长度也在变化,但是
或
的值是一个定值,请判断哪个值为定值?并以图1或图3为例,求出这个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d33432aba68024ae06ede52b6d56edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d33432aba68024ae06ede52b6d56edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af973c2aa9fda9414cd2d635efa20503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e07b15cfb3b56c8a836832a85c0d1ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/e6be4f87-7f32-4a3b-89c4-5b97ed9f1d0d.png?resizew=714)
(1)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5498a21de00786d6f88ff98ad57f3b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e720f3a5f45ec4fab27c6f14196055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)通过探究发现,随着旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc0473aa73926c0eda5c803391d5cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745142f305d98fd39d83dcb540f16688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e276bfa987d20a67dc93b67d82d9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4a74a7a2161a7267769e1495c448ee.png)
您最近一年使用:0次
3 . 如图,正方形
的边长为1,点
是
边上的动点,从点
沿
向
运动,以
为边,在
的上方作正方形
,连接
.请探究:
与
是否相等?请说明理由.
(2)若设
,
,当
取何值时,
最大?
(3)连接
,当点
运动到
的何位置时,
?
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(2)若设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c30f73c718bde8352055a14987fc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575c1b80e7dc2475bc8423cff8a0bbcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82520797e3e2f6770747ce189a2dcfff.png)
您最近一年使用:0次
2023-10-04更新
|
40次组卷
|
2卷引用:河北省石家庄市井陉县陉山中学2023-2024学年九年级上学期月考数学试题
4 . 如图,在平面直角坐标系中,
是反比例函数
(
,
)的图像上一点,点
的横坐标为
,点
是
轴正半轴上的一点,连接
,
,交
轴于点
,延长
到点
,使得
,过点
作
平行于
轴,过点
作
轴的平行线交
于点
.
(1)当
时,求点
的坐标;
(2)请探究
的值是否变化?
(3)设点
的坐标为
,求
关于
的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dbc742bb30adbd5b2248750a7f175b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038859f0522418265bc7cd9b2f9ed64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/5bfc70a2-a563-466f-9388-7eb0fa54b710.png?resizew=170)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)请探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2024·河北·二模
5 . 如图1中仪器为日晷仪,也称日晷,是观测日影计时的仪器,它是根据日影的位置,指定当时的时辰或刻数,是我国古代较为普遍使用的计时仪器.小东为了探究日晷的奥秘,在不同时刻对日晷进行了观察.如图,日晷的平面是以点
为圆心的圆,线段
是日晷的底座,点
为日晷与底座的接触点(即
与
相切于点
).点
在
上,
为某一时刻晷针的影长,
的延长线与
交于点
,与
交于点
,连接
,
,
,
,
.
的度数为__________;
(2)求
的长;
(3)随着时间的推移,点
从图2时刻开始在圆周上顺时针转动,当点
到
的距离为
时,直接写出点
运动的长度.(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c7e725bcc8aea5a209ba22d0a5d277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b900e6b41d25a87b4601af3c9e1f201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)随着时间的推移,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14be107aa214cf044d619bd78c4a1653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0494dafbea4df1d95c758ddb656afa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bccacbdde830e1329412e3e8f42ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0062f4f00732a0cf11d1ac145c218b.png)
您最近一年使用:0次
名校
6 . 在
与
中,连接
,点M、N分别为
和
的中点,连接
.
(1)【观察猜想】
如图①,若
,
,
与
的数量关系是 ;
(2)【类比探究】
如图②,若
,请写出
与
的数量关系并就图②的情形说明理由;
(3)【解决问题】
如图③,
,
,将
绕点A进行旋转,当点D落在
的边上时,请求出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/140ca21e-be86-42b1-84e3-d94d0ad34d23.png?resizew=648)
(1)【观察猜想】
如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfdc7b71cae22c6d80bb559cf52f8e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)【类比探究】
如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba728e5eed281607b2505834f1b286b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)【解决问题】
如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8675cab62956d81b63235c8ae052b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd4536a28c612eeb4efe7017b70e290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2023-05-23更新
|
346次组卷
|
5卷引用:2023年河北省石家庄市第四十二中学中考二模数学试卷
2023年河北省石家庄市第四十二中学中考二模数学试卷2023 年山东省济南市钢城区中考二模数学试题2023年山东省济南市钢城区中考一模数学试题(已下线)2023年济南一模(几何综合)(已下线)2023年济南二模(几何综合)
7 . 嘉淇做数学探究实验,示意图如下:
,
,
,
均为直角三角形,其中
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/7d834b61-45e0-4d8e-9982-d8bda2d25e20.png?resizew=380)
第一步,如图1,将
的顶点
与点
重合,
在
上;
第二步,如图2,将
绕点O逆时针方向旋转,
,
与
边分别交于点
,
;
第三步,如图3,当
旋转到点
落在
上时停止旋转,此时点
在
上;
第四步,如图4,在第三步的基础上,点
带动
立即沿边
从点
向点
平移,当
点与点
重合时停止运动.
(1)如图2,当
时,∠
______;
(2)如图2,嘉淇发现
的值为定值
,请求出
值;
(3)如图3,
从初始位置到点
落在CE上,求
的度数及线段
的长;
(4)如图4,当点
落在
上时,直接写出 点
平移的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f668f6a01df9ddffdf39022f7ba43826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2236dbbf9bd5ac99fdaf700eded3ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686171942bd7698035016c732db43b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6662097cf94dc37facdaba44b49966d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55618177a60e7e88363126ddcfc44f7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/7d834b61-45e0-4d8e-9982-d8bda2d25e20.png?resizew=380)
第一步,如图1,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
第二步,如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
第三步,如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
第四步,如图4,在第三步的基础上,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bf5951da9752ccbb73eda4cfc7c0bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4fd93f6b89c5503822c1db7f1b06ac.png)
(2)如图2,嘉淇发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc45a27fb56e66bab7a8a80db98b06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd5cfc1134a08462e38256529685b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(4)如图4,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
8 . 我们已经学习了利用配方法解一元二次方程,其实配方法还有其他重要应用.
例:已知x可取任何实数,试求二次三项式
的最值.
解:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904f5a4e6022cf96219e7c2519c8ea19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b45c8058e2e80dd1b29df82c698855d.png)
∵无论x取何实数,总有
.
∴
,即无论x取何实数,
有最小值,是
.
(1)问题:已知
,试求y的最值.
(2)【知识迁移】在
中,
是
边上的高,矩形
的顶点P、N分别在边
上,顶点Q、M在边
上,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/b9a531ca-ff58-4f71-9fd4-9e6116befbc7.png?resizew=160)
探究一:
,求出矩形
的最大面积的值;(提示:由矩形
我们很容易证明
,可以设
,经过推导,用含有x的代数式表示出该矩形的面积,从而求得答案.)
(3)探究二:
,则矩形
面积S的最大值___________.(用含a,h的代数式表示)
例:已知x可取任何实数,试求二次三项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e2c1fa5386a080ac6be5f4e920a83a.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904f5a4e6022cf96219e7c2519c8ea19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b45c8058e2e80dd1b29df82c698855d.png)
∵无论x取何实数,总有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5667a4d6908fb8c31018fdb575e3f697.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07bc24c4e46d8711e5f167ab0489c2a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e2c1fa5386a080ac6be5f4e920a83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
(1)问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e10659259894416923e97dbe04d8167.png)
(2)【知识迁移】在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/b9a531ca-ff58-4f71-9fd4-9e6116befbc7.png?resizew=160)
探究一:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2a26cf77a64cca6b2616c6b4eca0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a6933507a396c0d116f3def64e2da1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d55e7a958b829ea3c028798e791a8b.png)
(3)探究二:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a893346e27c9f43b7b37cad3340aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
您最近一年使用:0次
9 . 综合实践
问题情境
在图
所示的直角三角形纸片
中,
是斜边
的中点.数学老师让同学们将
绕中点
做图形的旋转实验,探究旋转过程中线段之间的关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/8ddef10d-990e-4647-a25f-4c821e89feda.jpg?resizew=638)
解决问题
(1)“实践小组”的同学们将
以点
为中心按逆时针旋转,当点
的对应点
与
重合时,
与它的对应边
交于点
.他们发现:
.请你帮助他们写出证明过程.
数学思考
(2)在图
的基础上,“实践小组”的同学们继续将
以点
为中心进行逆时针旋转,当
的对应边
时,设
与
交于点
,
与
交于点
.他们认为
.他们的认识是否正确?请说明理由.
再探发现
(3)解决完上面两个问题后,“实践小组”的同学们在图
中连接
,他们认为
,
与
也具有一定的数量关系.请你写出这个数量关系______.(不要求证明)
问题情境
在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/8ddef10d-990e-4647-a25f-4c821e89feda.jpg?resizew=638)
解决问题
(1)“实践小组”的同学们将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237e26e2d6022145c440d7135874d125.png)
数学思考
(2)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da2aef5e6b83aa7f674f1164da81a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.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/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b96467ebb176e76e6e920aade399209.png)
再探发现
(3)解决完上面两个问题后,“实践小组”的同学们在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
您最近一年使用:0次
10 . 含30°角的直角三角板
中,
.将其绕直角顶点C顺时针旋转
角(
),得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
,边
与边
交于点D,过点 D作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
交
边于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
边经过点B时,求
的度数;
(2)小明发现在三角板旋转的过程中,
度数是定值,他在探究过程中需证明:
.
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
度数的范围;
(3)设
的面积为S,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
时,求
的长,以点
为圆心,
为半径作
,并判断此时直线
与
的位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3103a9141008afb6dff5564ee58f8be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e477724e91fad6273eb151496a6e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)小明发现在三角板旋转的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd519bfe47895e5ed56e834039353e4a.png)
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d713d6649c9b42283b1a0b83ba34cc56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda95fdeb2571aab2e1d645efa65b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
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