1 . 问题背景:如图1,在四边形
中,
,将
沿
翻折,点
的对应点
恰好落在
边上.
连接
,判断
的形状,说明理由;
(2)探究迁移
将
沿射线
平移得到
(点
的对应点分别为
),当点
的对应点
与点
重合时,求四边形
的周长;
(3)拓展创新
将
继续沿射线
平移得到
(点
的对应点分别为
),
与
交于点
,且
,将
绕点
在平面内自由旋转,当
时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db7d85a24547dde9e8ec84928eb09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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)
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)探究迁移
将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec75f5ccd5756d5b787c061c831dffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb452339f63edb5369b899addce5b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de4aae7fbed0dc38b911aaab38a9534.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e33d53d6c60a069de0c42ebcf5cb87ee.png)
(3)拓展创新
将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec75f5ccd5756d5b787c061c831dffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb452339f63edb5369b899addce5b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de4aae7fbed0dc38b911aaab38a9534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.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/0435f724a67b42436680115721cc3f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec75f5ccd5756d5b787c061c831dffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1d0a81a42c37ef1128ccf1ea646bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
您最近一年使用:0次
2 . 在数学活动课中,老师组织学生开展“如何通过折纸的方法,确定矩形纸片长边上的一个三等分点”的探究活动.
【操作探究】
“求知”小组经过一番思考和讨论交流后,进行了如下操作,如图1.
第1步:先将矩形纸片
沿对角线
对折,展开铺平,折痕为
;
第2步:将边
以某一合适长度向右翻折3次,折痕
与
交于点K;
第3步:过点K折叠矩形纸片,使折痕
,
交
于点N;
第4步:延长
交边
于点P,则点P为边
的三等分点.
证明过程如下:
由题意,得
.
∵
,∴
.
∴① .
∴
.同理,得
.
∴② .
∴
.则点P为边
的三等分点.
“励志”小组的操作如下,如图2.
第1步:先将矩形纸片
沿对角线
对折,展开铺平,折痕为
;
第2步:再将矩形纸片对折,使点A和点B重合,展开铺平,折痕为
;
第3步:沿
折叠矩形纸片,折痕
交
于点G;
第4步:过点G折叠矩形纸片,使折痕
.
【过程思考】
(1)补全“求知”小组证明过程中①②所缺的内容;
(2)“励志”小组经过上述操作,认为点M为边
的三等分点.请你判断“励志”小组的结论是否正确,并说明理由.
【拓展应用】
(3)如图3,将矩形纸片
对折,使点A和点B重合,展开铺平,折痕为
,将边
沿
翻折到
的位置,过点G折叠矩形纸片,使折痕
,若点M为边
的三等分点,求
的值.
【操作探究】
“求知”小组经过一番思考和讨论交流后,进行了如下操作,如图1.
第1步:先将矩形纸片
![](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/d40b319212a7e7528b053e1c7097e966.png)
第2步:将边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71432131d194730a67f3192d1f8679b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
第3步:过点K折叠矩形纸片,使折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bd9ab622a02ba751f565f749576bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc0f6aa0b8ec19dde4db21b3d214d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第4步:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
证明过程如下:
由题意,得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950476c26e07a8c863453d1d9b79c8c3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4bd9ab622a02ba751f565f749576bf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca58c00cfbf0d39b94e0f9858bb9619.png)
∴① .
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb8b8bb5991ad048f810faff978b6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc43db651de835c0b32a0161d24ee530.png)
∴② .
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200a0f17361099266c313af5e2362258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
“励志”小组的操作如下,如图2.
第1步:先将矩形纸片
![](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/d40b319212a7e7528b053e1c7097e966.png)
第2步:再将矩形纸片对折,使点A和点B重合,展开铺平,折痕为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第3步:沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
第4步:过点G折叠矩形纸片,使折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198beeaef815604729e37c09b24da353.png)
【过程思考】
(1)补全“求知”小组证明过程中①②所缺的内容;
(2)“励志”小组经过上述操作,认为点M为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【拓展应用】
(3)如图3,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198beeaef815604729e37c09b24da353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
您最近一年使用:0次
3 . 综合与实践
问题情境:
在数学活动课上,老师给出这样一个问题:如图①,矩形纸片
的边
,
,沿对角线
剪开,得到两个直角三角形纸片,分别为
和
.将
固定不动,平移
.
操作探究:
(1)如图②,把
沿射线
平移得到△
,当
,请直接写出平移的距离;
探究发现:
(2)如图③,把
射线
平移
得到△
,连接
,判断四边形
的形状,并证明;
探究拓展:
(3)记
为△
,将其拼接到如图④的位置,并使
与A重合,
与C重合,然后把△
沿射线
方向平移,平移的距离是
,使点
,D,
中的某一点与点B和C构成的三角形是等腰三角形,在图⑤中补全图形,求出你探究的等腰三角形和平移的距离l(写出一种即可)
问题情境:
在数学活动课上,老师给出这样一个问题:如图①,矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681a4c0e1bba3332b0dde5ce55d30e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
操作探究:
(1)如图②,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec34d4094be007547664b7407521535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd5204aa37efd48fdc45961fe810906.png)
探究发现:
(2)如图③,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efa6cb28309ee6db5ba6cb0720b4d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec34d4094be007547664b7407521535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682818b8222c0ee6fef8942ac00faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ecdb698bd9d00d684430e911e4d99d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/e66d62b4-c3e7-48df-979c-beddd71b693b.png?resizew=401)
探究拓展:
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e947d039f8e8af243a5632688d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e947d039f8e8af243a5632688d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d12bc4cde4507564a9e21e3a142b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/868efb7d-486e-424b-8942-36984b5a4c66.png?resizew=277)
您最近一年使用:0次
2024-04-06更新
|
77次组卷
|
2卷引用:2023年四川省成都市九年级中考模拟测试数学模拟预测题(二)
4 . 探究式学习是新课程倡导的重要学习方式,某兴趣小组拟做以下探究.
在
中,
是
边上一点,且
(
为正整数),
是
边上的动点,连接
,过点
作
交直线
于点
.探究线段
之间的数量关系.
(1)【初步成知】
如图1,当
时,以下是小亮和小红两位同学的证明片段,请仔细阅读并补全小红的证明过程.
(2)【深入探究】
①如图2,当
,且点
在线段
上时,试探究线段
之间的数量关系,请写出结论并证明;
②请通过类比、归纳、猜想,探究出线段
之间的数量关系的一般结论.(直接写出结论,不必证明)
(3)【拓展运用】
在(1)的条件下,连接
,设
的中点为
,若
,请直接写出点
从点
运动到点
的过程中,点
运动的路径长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/e20492dd-400b-4b9f-ae96-42485aacc579.png?resizew=461)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebed2c063afddb3e07f478e21daaf9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825671c551cc4593793b40c43d46757a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.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/c818110255bdad691f61be6461a6fd73.png)
(1)【初步成知】
如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
小亮: 证明:连接 ![]() ![]() 由题意,可知 ![]() 即 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 小红: 证明:过点 ![]() ![]() ![]() ![]() ![]() 由题意,可知 ![]() ![]() ![]() ![]() ![]() 易得 ![]() ![]() …… |
(2)【深入探究】
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
②请通过类比、归纳、猜想,探究出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
(3)【拓展运用】
在(1)的条件下,连接
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
5 . 【概念呈现】在钝角三角形中,钝角的度数恰好是其中一个锐角的度数与90度的和,则称这个钝角三角形为和美三角形,这个锐角叫做和美角.
【概念理解】(1)当和美三角形是等腰三角形时,求和美角的度数.
【性质探究】(2)如图1,
是和美三角形,
是钝角,
是和美角,
求证:
.
【拓展应用】(3)如图2,
是
的直径,且
,点C,D是圆上的两点,弦
与
交于点E,连接
,
,
是和美三角形.
①当
时,求
的长.
②当
是和美三角形时,直接写出
的值.
【概念理解】(1)当和美三角形是等腰三角形时,求和美角的度数.
【性质探究】(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcab95fe4c5763054ab3d15ec8aa9ad8.png)
【拓展应用】(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a205a7eab74e544c9e5635f1ef9e9702.png)
您最近一年使用:0次
6 . 在中,
,
是直角三角形,
,
点
是
的中点.
【初步发现】
如图①,当的顶点
在边
上时,若
,猜想
与
的数量关系,并写出(不需要证明);
【猜想验证】
小红说:在【初步发现】的条件下,还可得到线段.你认为她的说法正确吗?说明理由;
【拓展延伸】
如图②,当的顶点
在边
上时,若
,探究线段
与线段
的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/b728ecff-dfd7-4b61-a2e0-01525d06a94f.png?resizew=392)
您最近一年使用:0次
7 . 【活动探究】在数学课上,老师出示了一个问题:如图1,在菱形
中,
,
,点E,F分别是
,
边上一点,若
,试猜想
的形状,不用证明.
【尝试实践】小美受此启发,她尝试将“
”改为“
”,通过测量验证发现猜想仍然成立,并进一步思考证法:如图2,过点F作
,求证
……
请你按照小美的思路进一步思考,并解答这个问题.
【拓展应用】小玲在老师问题上进一步改编:如图3,过C作
于点G,当
的中点M经过
时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
【尝试实践】小美受此启发,她尝试将“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cedc6911d02394383004ef17213ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc93ed7ca69476da54cd89198f36537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c9b5c2eccaf71272588614ea32dffd.png)
请你按照小美的思路进一步思考,并解答这个问题.
【拓展应用】小玲在老师问题上进一步改编:如图3,过C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f4eb640505099730001c4cbe65c3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
名校
8 . 探究式学习是新课程倡导的重要学习方式,某兴趣小组拟做以下探究.
如图1,等腰
中,
,以
为直径的
与
所在直线、
分别交于点
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/efec3f70-936e-46df-912d-9441bfa99b80.png?resizew=299)
【初步感知】(1)求证:
为
的切线;
【深入研究】(2)当
时,若
,求
的长.
【拓展延伸】(3)如图2,当
时,若
,求
的长.
如图1,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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/31e4b205e6f05e38c12b510b841b6a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/efec3f70-936e-46df-912d-9441bfa99b80.png?resizew=299)
【初步感知】(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
【深入研究】(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f5d00d8fe56bf189591a7afa4bb811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60eb2b8fbf9e805f8bde2ae96b350aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【拓展延伸】(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/628ca464d6d1af19ffe719759667bf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2024-03-15更新
|
549次组卷
|
2卷引用:云南省昆明市五华区第八中学2024年初中学业水平考试数学模拟试题
9 . 几何综合:
已知:点
是
边
上一动点,作
∽
,点
、点
分别是边
、
的中点,连接
、
;设
(常数
).
(1)证明推断:
若
.如图①,当
时,
①求证:
≌
;
②推断:当
时,
_____;
(2)类比探究:
若
.如图②,当
时,试写出线段
、
、
与常数
之间一个相等关系,并证明;
(3)拓展应用:
若
.如图③,设
,
,当
,
时,求常数
的值和线段
的长度.
已知:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8e33929752b1cb4dd36ee9b98b45d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e6228ef979d12858839a11477a0eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/e43e829a-eb97-4c29-9a67-f6b0d523a684.png?resizew=460)
(1)证明推断:
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a888af84a973afcc566759428cf8ba38.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50244defdb202cc420e1d6a910241c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e671075faf64db9b6bafa0696d9846c1.png)
②推断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4d54b7ff95f2bb56fc6f7979fae83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6502d8757b1d53b825af7b315bdb194.png)
(2)类比探究:
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4d54b7ff95f2bb56fc6f7979fae83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac57c755370b6cbf96fcd3314dabb99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd3a43e2c4528f40e546ceeb7bd3945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3978fefb5b9f3178d63043e1148aeb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)拓展应用:
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4d54b7ff95f2bb56fc6f7979fae83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841bcbdb968142a2d418d2f6de1e3ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d08d15a1fc1bce496b40ecb7eab0e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
您最近一年使用:0次
10 . 综合与实践
问题情境:
在“综合与实践”课上,老师提出如下问题:如图1,
是线段
上的一点,以
和
为直角边分别作等腰直角
和等腰直角
,点
在边
边上,连接
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/729d8307-29e4-4e6e-bc21-8b2ea6d9636e.png?resizew=150)
独立思考:
(1)试判断
和
的位置关系,并说明理由.
实践探究:
(2)“聪慧小组”受此问题的启发,将图
中的
绕着点
逆时针旋转角度
,使得点
落在
的外部,得到
,点
的对应点为
,点
的对应点为
,连接
,
,如图
,请判断
与
之间的位置关系,并加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/b7081816-6ee7-4fae-b917-e7c1c5e8d6ab.png?resizew=158)
拓展探究:
(3)“善思小组”奇想:如图
,将
绕着点
逆时针旋转角度
时,得到
,连接
,
交
于点
,延长
交
于点
,该小组提出一个问题:若
是线段
的中点,
的面积为
,求
的面积,请你思考此问题,直接写出该问题的结果.
问题情境:
在“综合与实践”课上,老师提出如下问题:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/729d8307-29e4-4e6e-bc21-8b2ea6d9636e.png?resizew=150)
独立思考:
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
实践探究:
(2)“聪慧小组”受此问题的启发,将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7199ded47c047792b3147c25467359c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240ee6902d209dfd156f4ae98e59c077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/b7081816-6ee7-4fae-b917-e7c1c5e8d6ab.png?resizew=158)
拓展探究:
(3)“善思小组”奇想:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240ee6902d209dfd156f4ae98e59c077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d30252720ff0a2b1f105523e9aa3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73afe528350ff17da6fc586fd617495f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71810d999101380a843fd798aa28355c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/32502ab9-1768-4e1e-b103-9a422b1bffd2.png?resizew=157)
您最近一年使用:0次