在一次数学探究活动中,李老师设计了一份活动单:
“追梦”学习小组通过操作、观察、讨论后汇报:点A的位置不唯一,它在以BC为弦的圆弧上(点B、C除外),….小华同学画出了符合要求的一条圆弧(如图1).
(1)小华同学提出了下列问题,请你帮助解决.
①该弧所在圆的半径长为_______;
②△ABC面积的最大值为_______;
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为A′,请你利用图1证明∠BA′C>30°.
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,已知矩形ABCD的边长AB=
,BC=5,点P在直线CD的左侧,且∠DPC=60°,求线段PB长的最小值为_______.
已知线段BC=2,使用作图工具作∠BAC=30°,尝试操作后思考: (1)这样的点A唯一吗? (2)点A的位置有什么特征?你有什么感悟? |
(1)小华同学提出了下列问题,请你帮助解决.
①该弧所在圆的半径长为_______;
②△ABC面积的最大值为_______;
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为A′,请你利用图1证明∠BA′C>30°.
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,已知矩形ABCD的边长AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/d511601c-5a89-4265-aeb5-5031f148b2c6.png?resizew=338)
更新时间:2021-11-02 17:23:25
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相似题推荐
解答题-问答题
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【推荐1】如图,已知二次函数
的图象与x轴交于A,B两点,(点A在点B左侧),与y轴交于点C,点A的坐标为
,且对称轴为直线
,直线
交抛物线于点
.
(2)在抛物线的对称轴上是否存在一点M,使
的周长最小,若存在,求出点M的坐标;
(3)如图2,点P是线段
上的一动点(不与A、B重合),过点P作
交
于E,连接
,当
的面积最大时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee8c50793afd59e6ab4a2be5a877759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a89435fe89cf3791e1bd40785d7d16b.png)
(2)在抛物线的对称轴上是否存在一点M,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
(3)如图2,点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc91c40699abd1745056e139f7a18fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d06fad1ed5a452a835e9a02cb011ed2.png)
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【推荐2】如图,直线
:
与
轴相交于点
,直线
:
经过点
,与
轴交于点
,与
轴交于点
,与直线
交于点
.
(1)求直线
的函数表达式;
(2)求点
的坐标;
(3)设点
的坐标为
,是否存在
的值,使得
的值最小?若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631386549c0cec5981a1da47b05e5d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbdef5d0c05acbf63fa72fa85c5bb45.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/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/db54841d-2ac0-4d1e-82d5-83d116cacfa7.png?resizew=138)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cc12877eb3be078ac11b093f7dfeca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6e5fa84e332463b494142d4054e603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】阅读与思考
下面是一篇数学小论文,请仔细阅读并完成相应的任务.
“三点共线模型”及其应用
背景知识:通过初中学习,我们掌握了基本事实:两点之间线段最短.根据这个事实,我们证明了:三角形两边的和大于第三边.根据不等式的性质得出了:三角形两边的差小于第三边.
知识拓展:如图,在同一平面内,已知点
和
为定点,点
为动点,且
为定长(令
),可得线段
的长度为定值.我们探究
和两条定长线段
,
的数量关系及其最大值和最小值:当动点
不在直线
上时,如图
,由背景知识,可得结论
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/138c0eff-3d7a-4bc1-aaa4-7b1e5c64e431.png?resizew=519)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/a8bcd1d9-87fb-401f-a910-4adb5a446c62.png?resizew=123)
当动点
在直线
上时,出现图
和图
两种情况.在图
中,线段
取最小值为
;在图
中,线段
取最大值为
.
模型建立:在同一平面内,点
和
为定点,点
为动点,且
,
为定长(
),则有结论
≥
,
.当且仅当点
运动至
,
,
三点共线时等成立.
我们称上述模型为“三点共线模型”,运用这个模型可以巧妙地解决一些最值问题.
任务:
(1)上面小论文中的知识拓展部分.主要运用的数学思想有 ;(填选项)
A.方程思想 B.统计思想 C.分类讨论 D.函数思想
(2)已知线段
,点
为任意一点,那么线段
和
的长度的和的最小是
;
(3)已知
的直径为
,点
为
上一点,点
为平面内任意一点,且
,则
的最大值是
;
(4)如图4,
,矩形
的顶点
、
分别在边
、
上,当
在
边上运动时,
随之在
上运动,矩形
的形状保持不变.其中
,
.运动过程中,求点
到点
的最大距离.
下面是一篇数学小论文,请仔细阅读并完成相应的任务.
“三点共线模型”及其应用
背景知识:通过初中学习,我们掌握了基本事实:两点之间线段最短.根据这个事实,我们证明了:三角形两边的和大于第三边.根据不等式的性质得出了:三角形两边的差小于第三边.
知识拓展:如图,在同一平面内,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7191f09f447b5929962f75f52d2f4fbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8b3ab2340d5408301b3b21dac36a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85533eb844a5571ccee02328a17b24e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/138c0eff-3d7a-4bc1-aaa4-7b1e5c64e431.png?resizew=519)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/a8bcd1d9-87fb-401f-a910-4adb5a446c62.png?resizew=123)
当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65912784543a113b1e1c86e162b4537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6926cf539cca1f818f391aa52eeb44.png)
模型建立:在同一平面内,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7191f09f447b5929962f75f52d2f4fbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6926cf539cca1f818f391aa52eeb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8943b0c1af0a13745e715989902468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
我们称上述模型为“三点共线模型”,运用这个模型可以巧妙地解决一些最值问题.
任务:
(1)上面小论文中的知识拓展部分.主要运用的数学思想有 ;(填选项)
A.方程思想 B.统计思想 C.分类讨论 D.函数思想
(2)已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04677de22b01b81ddc25b91a2cb449e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f015ed8e497b4394053ddd19683a98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a3a3d168a18401e47576f70a692e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe3a78950f6a4bb479c7ec0d8e57b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72026e70f45cea6a7c49881592e73a02.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5992036c739557714bc05e08a93bdd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc6f90f41388dff525161c86e01f3ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe3a78950f6a4bb479c7ec0d8e57b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72026e70f45cea6a7c49881592e73a02.png)
(4)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e9818b013c0d75b09926cf4c6e846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b5e86e15058757b1eb106d1e9faa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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名校
【推荐1】已知
,
,点
为射线
上一动点(不与点
重合),
关于
的轴对称图形为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/04c028bb-1ede-44af-b7bd-44b5667cdf62.png?resizew=520)
(1)如图1,当点
在射线
上时,求证:四边形
是菱形;
(2)如图2,当点
在射线
,
之间时,若点
为射线
上一点,点
为
中点,连接
,
,
,
①求证:
为直角三角形;
②求
的长;
(3)如图3,在(1)的条件下,若
,点
,
分别是线段
,
上的两点,且
,
,点
为射线
上一动点,
是否存在最小值.若存在,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7dc43a39738e3e2a0b819be505c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/04c028bb-1ede-44af-b7bd-44b5667cdf62.png?resizew=520)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4b32b2a9a7f6db6f7e45de853a5bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11746005a0e806f2d27f89e3d9e9c2.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)如图3,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c6744b84509b256ada95d6c3cf0f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15717ac23973d9713dd324d6a096c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0336889906578d268ed090f3e5223a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0336889906578d268ed090f3e5223a65.png)
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真题
【推荐2】(1)已知:
是等腰三角形,其底边是
,点D在线段
上,E是直线
上一点,且
,若
(如图①).求证:
;
(2)若将(1)中的“点D在线段
上”改为“点D在线段AB的延长线上”,其它条件不变(如图②),(1)的结论是否成立,并说明理由;
(3)若将(1)中的“若
”改为“若
”,其它条件不变,则
的值是多少?(直接写出结论,不要求写解答过程)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.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/d9222d7da0ed53d7fa16992b9425cff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9ebe3ed902a71c9b9d6006d70d8256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad079f33038b2f8703917c84c6ff246.png)
(2)若将(1)中的“点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若将(1)中的“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9ebe3ed902a71c9b9d6006d70d8256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b54a435385d10971afc58b01a1d87e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8e84d2865cf8ddd5cf4c4da5f8dee2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/3b8beb5a-d13c-454b-a58c-8d7b1c5abdf0.png?resizew=392)
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名校
【推荐1】如图,长方形ABCD绕点C旋转到长方形CEFG处,点B的对应点E落在AD边上,
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847104426917888/2927756064243712/STEM/da90699f-1f7f-4006-92ba-8dbf6bb07302.png?resizew=440)
(1)若
,
,如图(1),连接DF.
①求DE的长;
②求
的面积.
(2)若
,
,如图(2),连接BG,BG交EC于点H,连接DH,求
的面积.
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847104426917888/2927756064243712/STEM/da90699f-1f7f-4006-92ba-8dbf6bb07302.png?resizew=440)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
①求DE的长;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b238947afe06e2fb5f2a98bde3bd0f01.png)
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【推荐2】有两张完全重合的长方形纸片,将其中一张绕点
顺时针旋转
后得到长方形
(如图1),连接
,
,若
,
.
(1)试探究线段
与线段
的数量关系和位置关系,并说明理由;
(2)把
与
剪去,将
绕点
顺时针旋转得
,边
交
于点
(如图2),设旋转角为
,当
为等腰三角形时,求
的度数;
(3)若将
沿
方向平移得到
(如图3),
与
交于点
,
与
交于点
,当四边形
恰好是长方形时,求平移的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a6f856872cd504d322ae27919ef2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e857e447e4896ff57978a78a96ad28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/d539bb27-e5ac-41ca-a2d4-7a5dbb767dce.png?resizew=469)
(1)试探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
(2)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadb6f330e2d5325adb08c2b1d80b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891b72156544758442245afbaa566c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c2ab2ee2baba26987b861b78f8d42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb73d71d7941459e9a56212eca0aff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef6516358878a47560b1d9eff2d5c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc33e85cb0ea7ae4e119c32b093fa5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc17f5b154215271127a4d86131fcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f035db677f9c0b273316792a75997b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8681566ee671026726b4326ee11ab331.png)
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(0.4)
【推荐1】如图,
为
的直径,
,
、
分别在
两侧的圆上,
,
与
的交点为
.
![](https://img.xkw.com/dksih/QBM/2020/12/6/2608388078346240/2611769499312128/STEM/daeaef66-f4f7-4119-93f2-59d43f42a41d.png?resizew=178)
(1)求点
到
的距离及
的度数;
(2)若
,求
的值和
的长.
![](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/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/12/6/2608388078346240/2611769499312128/STEM/daeaef66-f4f7-4119-93f2-59d43f42a41d.png?resizew=178)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3081d405e3066e17402105ebd7d1335f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce45219c1c0c50d8dfcd8d156009652f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caef1dbcb33e462cca07546b4035709e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如图1,在
中,
,
,
,
是
的中点.经过
,
,
三点的
交
于点
,连接
.
和
的长;
(2)如图2,两动点P、Q分别同时从点A和点C出发匀速运动,当点P运动到点E时,点Q恰好运动到点B,P、Q停止运动,连接
.
①记
,当
的面积最大时,求x的值;
②如图3,连接
并延长交
于点
,连接
、
.当
平分
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图2,两动点P、Q分别同时从点A和点C出发匀速运动,当点P运动到点E时,点Q恰好运动到点B,P、Q停止运动,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
①记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51ece6bb53c3f5bf2da7d9ee5960e44.png)
②如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e99c17d72c203b50802f19d4731545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8155e0dbc817c1f2a6f2d9a7bb17adf6.png)
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