名校
1 . (1)证明推断:如图1,在正方形
中,点E,Q分别在边
上,
于点O,点G,F分别在边
上,
,求证:
;
(2)类比探究:如图2,在矩形
中,
,将矩形
沿
折叠,使点A落在
边上的点E处,得到四边形
,
交
于点H,连接
交
于点O,试探究
与
之间的数量关系,并说明理由;
(3)拓展应用:在(2)的条件下,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8681dc7b0483bb527802389b03129b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70daa268c7a0b17f39c1e6eba043a3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bbdea60708bebc259452cc5e07ea5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7b05f1f0d9dfcd37da1e437861aae6.png)
(2)类比探究:如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483e5e695460e1752a7f9b0ee3f0b6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19191ca20cae3123d7df1b3a2ec5a857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展应用:在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313487069c46cb24487d6a48c0cc589a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a2e0b739038c0e756aa511920fa300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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2 . 综合与实践:
数学活动课上,同学们发现以下结论:如图
,已知等腰
和等腰
,其中
,射线
与
相交于点
,那么
和
数量关系是________,
和
位置关系是________;
【思考尝试】
如图
,已知四边形
和四边形
都是正方形,
是等腰直角三角形,
,连接
.同学们发现若能证明四边形
为平行四边形,即可找出
与
的数量关系.请你根据以上思路,直接写出
与
的数量关系________;
【实践探究】
如图
,四边形
和四边形
都是矩形,若
,连接
.求出
与
的数量关系;
【拓展迁移】
如图
,在【实践探究】的基础上,若
,
,如果
所在直线相交于点
,请直接写出矩形
绕点
旋转一周过程中
长度的最小值________.
数学活动课上,同学们发现以下结论:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【思考尝试】
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/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc5c12b241539cc99487865f7d8bf34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee9a78b3e30a2fdec94bd07e0ed2de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b70b4115c3f2d6b2c0e76520e4cbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19232863167a25d31369eb862aa4c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【实践探究】
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0f551d8fd3dce44ca73727acff54ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897527a1aace2e9de1bb84bce69b086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【拓展迁移】
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9962e4b61d0a856eaeb32aa6f6864247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
您最近一年使用:0次
名校
3 . 【问题初探】
(1)如图1,等腰
中,
,点
为
边一点,以
为腰向下作等腰
,
,连接
,
,点
为
的中点,连接
.猜想并证明线段
与
的数量关系和位置关系.
(2)在(1)的条件下,如图2,将等腰
绕点B旋转,上述结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
【拓展迁移】
(3)如图3,等腰
中,
,
.在
中,
,
.连接
,
,点
为
的中点,连接
.
绕点
旋转过程中,
①线段
与
的数量关系为:__________;
②若
,
,当点F在等腰
内部且
的度数最大时,线段
的长度为__________.
(1)如图1,等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c8e368a7a2346a3922f5c532823d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd66f89184ca925f4575c26053decf2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(2)在(1)的条件下,如图2,将等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c8e368a7a2346a3922f5c532823d.png)
【拓展迁移】
(3)如图3,等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c8e368a7a2346a3922f5c532823d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd66f89184ca925f4575c26053decf2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabdb76cad3e09a06f82a8ce80666c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c8e368a7a2346a3922f5c532823d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71989b96a7c7ade1879bbb9bd2cffb1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9ad150cb1e4cd8977d4cc3d99be17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd94dd51562ecbee6edd4265326b765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
您最近一年使用:0次
4 . 如图Ⅰ,已知
和
均为等腰直角三角形,点
,
分别在线段
,
上,
.
【观察猜想】
(1)将图Ⅰ中的
,绕点A逆时针旋转,连接
,
,且
的延长线交
于点
,得到图Ⅱ.若
的延长线恰好经过点
(即点
,
重合),直接写出
与
间的数量关系;
【类比探究】
(2)继续旋转图Ⅱ中的
,连接
,
,且
的延长线交
于点
(此时点
,
不重合),得到图Ⅲ.
①(1)中的结论是否改变?若不变,请证明;若改变,写出新的结论并证明;
②求
的度数;
【拓展延伸】
(3)若
,
,
在旋转过程中,当
所在的直线垂直于
时,求线段
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/692dd8eb-89ab-40e8-9b97-77e0798b016d.png?resizew=440)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/0e1bff74f3356bff74a51c48524bd13b.png)
【观察猜想】
(1)将图Ⅰ中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【类比探究】
(2)继续旋转图Ⅱ中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①(1)中的结论是否改变?若不变,请证明;若改变,写出新的结论并证明;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
【拓展延伸】
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e6292216592a5eba3293a85bbdb3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571508bc4c42f2a2b2b223f871a6b155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/692dd8eb-89ab-40e8-9b97-77e0798b016d.png?resizew=440)
您最近一年使用:0次
名校
5 . 图形的旋转变换是研究数学相关问题的重要手段之一,小华和小芳对等腰直角三角形的旋转变换进行了研究.如图①,已知
和
均为等腰直角三角形,E分别在线段
,
上,且
.
绕点A逆时针旋转,连接
,
,如图②,当点E与点F重合时:
①
的值为______;
②
的度数为______度;
(2)类比探究:如图③,小芳在小华的基础上继续旋转
,连接
,(1)中的两个结论是否仍然成立?请说明理由;
(3)拓展延伸:若
,当
所在的直线垂直于
时,直接写出
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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1bff74f3356bff74a51c48524bd13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
(2)类比探究:如图③,小芳在小华的基础上继续旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6b0a922a6f333ef229d16e93d41bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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2024-04-07更新
|
140次组卷
|
6卷引用:河南省新乡市辉县市市城关初级中学2021-2022学年九年级上学期期中数学试题
河南省新乡市辉县市市城关初级中学2021-2022学年九年级上学期期中数学试题2022-2023学年 吉林省长春市第二实验学校九年级下学期 第一次模拟考试数学试题江苏省宿迁市沭阳2023-2024学年九年级下学期第一次调研测试数学试题2024年江苏省宿迁市沭阳县沭河初级中学中考数学一调模拟预测题(已下线)重难点02相似三角形四种模型(模型解读+典例剖析+培优争分练)-2024年中考数学【热点·重点·难点】专练(安徽专用)2024年宁夏银川市北塔中学九年级中考第二次模拟九年级数学试题
6 . (1)证明推断:如图(1),在正方形
中,点
,
分别在边
,
上,
于点
,点
,
分别在边
,
上,
.推断:
的值为 ;
(2)类比探究:如图(2),在矩形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714c979d980d5377a6cc93a452bffe8b.png)
常数
.将矩形
沿
折叠,使点
落在
边上的点
处,得到四边形
,
交
于点
,连接
交
于点
.试探究
与
之间的数量关系,并说明理由;
(3)拓展应用在(2)的条件下,连接
,当
时,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8681dc7b0483bb527802389b03129b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bbdea60708bebc259452cc5e07ea5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f12d3876f1b0ffaf9179fb85c0e683.png)
(2)类比探究:如图(2),在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714c979d980d5377a6cc93a452bffe8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149cc2b83646528579a46d5ed2ee820e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af83aa2410d6ab5d74a984b8fd745cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5e8e26cd0d8d8943a0a0d8345b4d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6cd332590b9eb4032b51a39134d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af83aa2410d6ab5d74a984b8fd745cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af83aa2410d6ab5d74a984b8fd745cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
(3)拓展应用在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d71107894329b293117036013dcbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4650373bd07e1a66859ccdfbe2e313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e6edb9dbe91787f764cf056bbfa8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
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名校
7 . 折纸是我国传统的民间艺术,通过折纸不仅可以得到许多美丽的图形,折纸的过程还蕴含着丰富的数学知识,在综合与实践课上,老师让同学们以“正方形的折叠”为主题开展了数学活动.
(1)操作判断:
在上选一点
,沿
折叠,使点
落在正方形内部的点
处,把纸片展平,过
作
交
、
、
于点
、
、
,连接
并延长交
于点
,连接
,如图
,当
为
中点时,
是______三角形.
(2)迁移探究:
如图,若
,且
,求正方形
的边长.
(3)拓展应用:
如图,若
,直接写出
的值为______.
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8 . (1)【感知】如图1,在等边三角形
的外角
内引射线
,作点
关于
的对称点
点
在
内
,连接
,
、
分别交
于点
、
.求
的度数.
(2)【类比探究】如图2,把(1)中的“等边三角形
”改为“等腰直角三角形
,其余条件不变.
①
________;
②猜想线段
、
、
之间的数量关系,并说明理由.
(3)【拓展】如图3,点
为射线
上的点,且
,将线段
绕点
顺时针旋转
得到线段
,在
内引射线
,作点
关于
的对称点
(点
在
内),连接
,
、
分别交
于点
、
,当点
为
的重心时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbd1aaae1a60dad163311e2393c2637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4a09b039767ac971d7231cbc425fb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbd1aaae1a60dad163311e2393c2637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d335bf8cb2e6e5e50d0e03a14d1f48d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/0b776e82-9931-428b-b4b4-124edbd19a57.png?resizew=180)
(2)【类比探究】如图2,把(1)中的“等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/35b2df21-26b9-4673-a2b9-b2237cd5a7e2.png?resizew=170)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a04ae1a1c765340552e757fa37c4e0a.png)
②猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
(3)【拓展】如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1358e073cf900f149bd755b853fd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2868ed262879ffbb5aa0379c1fd8d382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7d54c94ade2dcb26e7d5124a81b4c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.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/6fbd1aaae1a60dad163311e2393c2637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/1bde9cad-84b1-497d-b312-149468e5220d.png?resizew=239)
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9 . 【问题情境】在数学活动课上,奋飞组的同学在延时课上用两张矩形纸片进行探究活动.小组同学准备了两张矩形纸片
和
,其中
,
,将它们按如图1所示的方式放置,点E,G分别落在
,
边上时,点E,G恰好为边
,
的中点.然后将矩形纸片
绕点B按顺时针方向旋转,旋转角为α,连接
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/88db2e31-b28a-4ba6-9d12-a0e4de223170.png?resizew=423)
【观察发现】
(1)如图2所示,当
时,小组成员发现
与
存在的数量关系为______;位置关系为______;
【探索猜想】
(2)如图3所示,当
时,(1)中发现的结论是否仍然成立?请说明理由;
【拓展延伸】
(3)在矩形
的旋转过程中,连接
,
,得
为定值,请直接写出此定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/88db2e31-b28a-4ba6-9d12-a0e4de223170.png?resizew=423)
【观察发现】
(1)如图2所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
【探索猜想】
(2)如图3所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
【拓展延伸】
(3)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](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/b348cef81feb80ed7e79a5d9e67ef48d.png)
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10 . 【问题背景】为了保持室内空气的清新,某仓库的门动换气窗采用了以下设计:如图1,窗子的形状是一个五边形,该窗子关闭时可以完全密封,根据室内的温度和湿度也可以自动打开窗子上的通风口换气.通风口为
(阴影部分均不通风),点F为
的中点,
是可以沿窗户边框上下滑动且始终保持和
平行的伸缩横杆.
已知边框
,设
为a
,窗子的高度h(窗子的最高点到边框
的距离)
.
【初步探究】
(1)若
,
.
①
与
之间的距离为
,求此时
的面积.
②
与
之间的距离为x
,试将通风口的面积y
表示成关于x的函数.
③伸缩杆
移动到什么位置时,通风口面积最大,最大面积是多少?
【拓展提升】
(2)若金属杆
移动到高于
所在位置的某一处时通风口面积达到最大值.h需要满足的条件是 ,通风口的最大面积是
(用含a,h的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfb02e157819a2bdd0f2790cbc825e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
已知边框
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2de0126c416995c7d2c43ca1bd114c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
【初步探究】
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae96cd3fcb18e7ba8919bdf4aef510a6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfb02e157819a2bdd0f2790cbc825e9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd958a14e6e73401f7a95c06166fb0d.png)
③伸缩杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
【拓展提升】
(2)若金属杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
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