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.等边
的
边延长线上有一动点
,连接
,以
为边作等边
,连接
.
【初步感知】
(1)如图1,当
点不与
点重合时,兴趣小组探究得出结论:
①
;②
的度数是定值,请你写出他们的证明过程;
【深入探究】
(2)如图2,点
是线段
的中点,连接
,猜想
和
的数量关系.
小明猜想:假设
点刚好和
点重合时,猜想出结论是:
;
小红也提出了自己的想法:因为题设中提到了中点,所以想到添加中点构造辅助线进行转化.如图
,是小红添加的辅助线,点
,点
,点
分别是线段
,
,
的中点,请你帮她继续完成证明过程.
【拓展运用】
(3)在(2)的条件下,若等边
的边长是
,则点
从点
向右运动过程中,
的最小值是
.(直接写出答案,无需证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
【初步感知】
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189590914cde8d95141517df9bf1050f.png)
【深入探究】
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
小明猜想:假设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fb32a03264151340401a243118d973.png)
小红也提出了自己的想法:因为题设中提到了中点,所以想到添加中点构造辅助线进行转化.如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
【拓展运用】
(3)在(2)的条件下,若等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fb32a03264151340401a243118d973.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/d4b4dba7-86d0-4542-b84f-b9fb64f69172.png?resizew=463)
更新时间:2023-10-26 09:53:42
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解答题-问答题
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【推荐1】如图1,已知点
,
,且a、b满足
,平行四边形
的边
与y轴交于点E,且E为
的中点,双曲线
上经过C、D两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/0eefb530-5ec1-4f0e-b5af-5591b12e47ca.png?resizew=409)
(1)求k的值;
(2)点P在双曲线
上,点Q在y轴上,若以点A、B、P、Q为顶点的四边形是平行四边形,直接写出满足要求的所有点Q的坐标;
(3)以线段
为对角线作正方形
(如图3),点T是边
上一动点,M是
的中点,
,交
于N,当T在
上运动时,
的值是否发生变化,若改变,请求出其变化范围;若不改变,请求出其值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9486ec9dca95979803bf91ca6c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa6e5a12543f954be1a6057c6b2ed51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1a80812754bbfdc4d786279224a464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/0eefb530-5ec1-4f0e-b5af-5591b12e47ca.png?resizew=409)
(1)求k的值;
(2)点P在双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
(3)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f7cdcbc721fbde7d5bd0afbf07b529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d030bc03d5e8e2bbd79de338a7c375ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e605a9ab715e068a48f3d71cd35dc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96011b527f818364cfe804a39a0e77a7.png)
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【推荐2】把正方形
纸板按如图①方式放置在正方形纸板
上,顶点G在对角线
,并把正方形
绕顶点A沿逆时针方向旋转,旋转角为a.
![](https://img.xkw.com/dksih/QBM/2023/12/6/3383322201030656/3383348402405376/STEM/856d7bd5e3fe4c3489c92ba7b7f902b6.png?resizew=550)
(1)如图②,当
时,请直接写出线段
与
的数量关系和位置关系;
(2)如图③,当
时,(1)中的结论是否发生改变?若不变,请给出证明;若发生改变,请举例说明;
(3)如图④,将图①、图③中的两个正方形都改为相似矩形,其他条件不变,设
,当
时,(1)中的结论是否发生改变?若不变,请给出证明;若发生改变,请写出改变后的新结论,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5a8b3da77827d3f792c9f6c79b523f.png)
![](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/8e5a8b3da77827d3f792c9f6c79b523f.png)
![](https://img.xkw.com/dksih/QBM/2023/12/6/3383322201030656/3383348402405376/STEM/856d7bd5e3fe4c3489c92ba7b7f902b6.png?resizew=550)
(1)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449d9e1077ec791367d36557259fbece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8707b9656a3205dead482c10bdb7561b.png)
(3)如图④,将图①、图③中的两个正方形都改为相似矩形,其他条件不变,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e02ce8d5182cd884f59a648a17c579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8707b9656a3205dead482c10bdb7561b.png)
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【推荐1】如图,在等边
中,
,
,如果点M以6cm/s的速度运动.
(1)如果点M在线段
上由点C向点B运动,点N在线段
上由B点向A点运动.它们同时出发,若点N的运动速度与点M的运动速度相等.经过2s后,
和
是否个等?请说明理由;
(2)在(1)的条件下,当两点的运动时间为多少时,
是一个直角三角形?
(3)若点N的运动速度与点M的运动速度不相等,点N从点B出发,点M以原来的运动速度从点C同时出发,都顺时针沿
三边运动,经过25s点M与点N第一次相遇,则点N的运动速度是多少cm/s.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09500471f9a8c85fd46077f9a8cbbba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6bb8180b5ec79816ba3a85be3da5bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/ef9785d5-70c5-4d0a-9af4-205217ca39f0.png?resizew=159)
(1)如果点M在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
(2)在(1)的条件下,当两点的运动时间为多少时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
(3)若点N的运动速度与点M的运动速度不相等,点N从点B出发,点M以原来的运动速度从点C同时出发,都顺时针沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】问题背景
定义:若两个等腰三角形有公共底边,且两个顶角的和是
,则称这两个三角形是关于这条底边的互补三角形.如图1,四边形
中,
是一条对角线,
,且
,则
与
是关于
的互补三角形.
中,
,D、E为
外两点,
,
为等边三角形.则
关于
的互补三角形是______,并说明理由.
(2)实践应用:如图3,在长方形
中,
.点E在
边上,点F在
边上,若
与
是关于
互补三角形,试求
的长.
(3)思维探究:如图4,在长方形
中,
.点E是线段
上的动点,点P是平面内一点,
与
是关于
的互补三角形,直线
与直线
交于点F.在点E运动过程中,线段
与线段
的长度是否会相等?若相等,请直接写出
的长;若不相等,请说明理由.
定义:若两个等腰三角形有公共底边,且两个顶角的和是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a2d7220744f3ed8e955bee0b6de172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e83a504f7b934d20bf50312afadbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482af0f0e170a58334ab33bf26c4375a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f30fddaf204f8bb0d5bf718851c6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)实践应用:如图3,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ad4f2343d94e45d1c1e7f466b630d4.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/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)思维探究:如图4,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ad4f2343d94e45d1c1e7f466b630d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fa7dd60b071d132afbfdaf170c1020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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名校
解题方法
【推荐1】在学习全等三角形知识时,数学兴趣小组发现这样一个模型,它是由两个共顶点且顶角相等的等腰三角形构成,在相对位置变换的同时,始终存在一对全等三角形,通过资料查询,他们知道这种模型称为手拉手模型.如图1,两个等腰直角三角形
和
,
,这个就是手拉手模型,在这个模型中易得到
.
![](https://img.xkw.com/dksih/QBM/2020/2/18/2401934692376576/2402986169712640/STEM/3c8399ea-6940-4919-b840-ba509abb5d60.png?resizew=577)
学习小组继续探究:
(1)如图2,已知
,以
、
为边分别向
外作等边
和等边
,并连接
、
,求证:
;
(2)小刚同学发现,不等腰的三角形也可得到手拉手模型,例如:在
中
,
,将三角形
旋转一定的角度(如图3),连接
和
,求证:
;
(3)如图4,四边形
中,
,
,
,
,
,请在图中构造小刚发现的手拉手模型求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04aa86c6bcb8f67706d0418e6e5dce56.png)
![](https://img.xkw.com/dksih/QBM/2020/2/18/2401934692376576/2402986169712640/STEM/3c8399ea-6940-4919-b840-ba509abb5d60.png?resizew=577)
学习小组继续探究:
(1)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33c2aa4cb5a3b8da3b188ab6a21520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
(2)小刚同学发现,不等腰的三角形也可得到手拉手模型,例如:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.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/de75a1660f3a59322df4c3fe88d3c4d2.png)
(3)如图4,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645b06bbe036df96e4138c7732e45824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddd94ffb273734f9587f1905ad63e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,正方形
的边长为
,
为对角线
上一动点,以
为直角顶点作
交直线
于点
,交直线
于点
,
(1)如图
,若点
与对角线交点
重合时,求证:
.
(2)如图
,若点
为线段
中点时,
①求证:
;
②如图
,当
点在线段
延长线上,且点
使得
,
分别交
,
于
,
,则线段
的长为______
直接写出答案
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3426e1f32ede857a604bcb1a04ceb3d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/5c1228ef-dc69-4a5f-b328-76085c034af4.png?resizew=467)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb746efbdf868fd08debb6813a91a04.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f890c8a0a5e7adb64cf8db5f4724c398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】如图,在Rt△ABC中,∠BAC=90°,点P为线段AB上不与A,B重合的一个动点,过点P作PQ⊥BC于点Q,将△BPQ绕点B逆时针旋转,连接CP,点D为CP中点,连接AD,AQ,DQ,已知AC=3,AB=6.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/385d5db2-8407-49b5-96cb-987dac29ccf1.png?resizew=520)
(1)当旋转角为0°时,如图1,线段AD与线段QD的数量关系为________;
(2)如图2,当点P,Q,C第一次旋转到一条直线上时,试找出线段CQ、PQ,AD的数量关系并说明理由;
(3)旋转过程中,当点P为边AB的三等分点时,直接写出线段AD的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/385d5db2-8407-49b5-96cb-987dac29ccf1.png?resizew=520)
(1)当旋转角为0°时,如图1,线段AD与线段QD的数量关系为________;
(2)如图2,当点P,Q,C第一次旋转到一条直线上时,试找出线段CQ、PQ,AD的数量关系并说明理由;
(3)旋转过程中,当点P为边AB的三等分点时,直接写出线段AD的最大值.
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
解题方法
【推荐2】如图1,
,
是两个等腰直角三角形,其中
,
,
,连接
,取
中点F,连接
.
与
的数量关系与位置关系;
(2)如图2,将
绕点C逆时针旋转,取
与
的中点G,H,当点G,H,F三点不共线时,连接
,求证:
;
(3)在(2)的条件下,连接
,在
绕点C旋转的过程中,求
面积的最小值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa74660971ce04b1041ecec0462e87e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95542ef7e3e4d47c2b9e71ff4257392a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a1efba81016d27d41b262b75e8e6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f89255b1b29e4856b56fdc831cee66.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25d95565e1e7f522624ed32e5a61199.png)
您最近一年使用:0次