课本再现:
如图
,
是一个正方形花园,
,
是它的两个门,且
.要修建两条路
和
,这两条路等长吗?它们有什么位置关系?
如图
,
是一个正方形草地,现要在内部修建两条路
、
,且
,
、
还相等吗?为什么?
②如图
,将边长为
的正方形纸片沿
折叠,点
落在
边上的点
处,若折痕
的长为
,求此时
的长;
如图
,将边长为
的正方形纸片沿
折叠,点
落在
边上的点
处,
与
交于点
,取
的中点
,连接
、
,则
的最小值为______,此时
的长度是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307e785b90bb03f946e84f4c06e45d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.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/e39adf871a542f06d911a891a75bab53.png)
![](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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851b5e53821ac0601c61a1dd694b3904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e61680ffc6f940bd5b8afda3ae9c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ad9c4320d0ae02f1ccec8f5e0f9688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd056bf480a04dafb4b6da24662cc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e61680ffc6f940bd5b8afda3ae9c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b65a0a12ec737cc3a3681a6579cc43b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2023-08-14 09:54:31
|
相似题推荐
解答题-问答题
|
较难
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名校
解题方法
【推荐1】如图,抛物线y=ax2+bx+6与x轴交于A(2,0),B(8,0)两点,与y轴交于点C.
(1)求抛物线的解析式;
(2)点P是抛物线上一动点,当∠PCB
∠BCO时,求点P的横坐标.
(1)求抛物线的解析式;
(2)点P是抛物线上一动点,当∠PCB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c70c0c5a061195b9941796b6a9acc4.png)
![](https://img.xkw.com/dksih/QBM/2022/1/3/2886283125874688/2888831950528512/STEM/8ad95b50-9893-46df-b231-95828f2a532c.png?resizew=241)
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名校
【推荐2】在△ABC中,AB=BC,∠B=90°,点D为直线BC上的一个动点(不与B、C重合),连结AD,将线段AD绕点D按顺时针方向旋转90°,使点A旋转到点E,连结EC.
(1)如果点D在线段BC上运动,如图1:
①依题意补全图1;
②求证:∠BAD=∠EDC;
③通过观察、实验,小明得出结论:在点D运动的过程中,总有∠DCE=135°,.
小明与同学讨论后,形成了证明这个结论的几种想法:
想法一:在AB上取一点F,使得BF=BD,要证∠DCE=135°,只需证△ADF≌△DEC.
想法二:以点D为圆心,DC为半径画弧交AC于点F,要证∠DCE=135°,只需证△AFD≌△DCE.
想法三:过点E作BC所在直线的垂直线段EF,要证∠DCE=135°,只需证EF=CF.
请你参考上面的想法,证明∠DCE=135°
(2)如果点D在线段CB的延长线上运动,利用图2画图分析,∠DCE的度数还是确定的值吗?如果是,直接写出∠DCE的度数;如果不是,说明理由.
(1)如果点D在线段BC上运动,如图1:
①依题意补全图1;
②求证:∠BAD=∠EDC;
③通过观察、实验,小明得出结论:在点D运动的过程中,总有∠DCE=135°,.
小明与同学讨论后,形成了证明这个结论的几种想法:
想法一:在AB上取一点F,使得BF=BD,要证∠DCE=135°,只需证△ADF≌△DEC.
想法二:以点D为圆心,DC为半径画弧交AC于点F,要证∠DCE=135°,只需证△AFD≌△DCE.
想法三:过点E作BC所在直线的垂直线段EF,要证∠DCE=135°,只需证EF=CF.
请你参考上面的想法,证明∠DCE=135°
(2)如果点D在线段CB的延长线上运动,利用图2画图分析,∠DCE的度数还是确定的值吗?如果是,直接写出∠DCE的度数;如果不是,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/4/f44d395b-9aeb-4190-baf4-031202bc1fbd.png?resizew=328)
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【推荐1】如图,抛物线
交
轴于
、
两点(点
在点
的左侧)坐标分别为
,
,交
轴于点
.
(2)如图1,过
轴上点
作
的垂线,交直线
于点
,交抛物线于点
,当
时,请求出点
的坐标;
(3)如图2,点
的坐标是
,点
为
轴上一动点,点
在抛物线上,把
沿
翻折,使点
刚好落在
轴上,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b2a489b5cf3185b70005f1489a3347.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/7f9e8449aad35c5d840a3395ea86df6d.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/9ab979573ebf184127b7117aa9c330d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0573e2af8a0dc8c6a1c0af067a324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图1,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3979e4fe805d69f957a6b9fe4dcbe03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7ede0702d2c873101e9564545d9d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6f4dca8364e8ab8ab0df0b645bf7a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72f02ad5ced321b7fcc960742533a0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c018b37259f3ead2ab2d94bd744f44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解答题-证明题
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【推荐2】综合与实践
问题情境:
中,
,
, 点E,F 分别是
上一点, 且
,点H,G 是
上两点, 且
.
操作发现:
(1)如图 (2), 先将
沿直线
折叠得到
, 展开后再将
沿直线
折叠得到
,再展开, 设
与
交于点O, 求证:
;
(2)如图(3),在(1)的条件下,若点
,
均落在
上, 且
是等边三角形,求
的长;
(3)如图 (4),在 (1) 的条件下,若点
,
重合于
上一点, 请直接写出
的长.
问题情境:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41c8cda3d17c87876675b6257cad476.png)
操作发现:
(1)如图 (2), 先将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3808b1501f14044cc16921c3080891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5334469e92d39043db84d86b792aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0669a3c9896dbc946fc8c6ae842256eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6936285f67bb81d2b1d9816c9d907904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f471199f861e2e7c4259884c3df3f122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d4738bcb76c9d0a611cfe2fcfd60ab.png)
(2)如图(3),在(1)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262ce01d5c912ebcc0622f47b4bd674a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
(3)如图 (4),在 (1) 的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6936285f67bb81d2b1d9816c9d907904.png)
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【推荐1】已知关于x的二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
(1)求抛物线
的顶点坐标(用含m的代数式表示).
(2)抛物线
过一定点,直接写出该定点的坐标.
(3)点A(-6,1),B(4,1).若以AB为边向上作正方形ABCD.
①当抛物线
的顶点在正方形的边上时,求m的值.
②当抛物线
的顶点在正方形的内部时,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
(2)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
(3)点A(-6,1),B(4,1).若以AB为边向上作正方形ABCD.
①当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
②当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20204eaa7d4804f07ecdf4c73aa4de.png)
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【推荐2】如图,梯形
中,
,
,
,
,
,点E为
上一点,且
,点F为
上一动点,以
为边作菱形
,且点H落在边
上,点G在梯形
的内部或边
上,设
.
(1)直接写出
的长与
的度数.
(2)在点F运动过程中,是否存在某个x的值,使得四边形
为正方形?若存在,请求出x的值;若不存在,请说明理由.
(3)若菱形
的顶点G恰好在边
上,则求出此时x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b23b5f8eb170bde1008225a7cfbd29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d68a7c1620c784fc641700fa004a8ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6996aa31bf1486ced60c2249a6e6989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4f3ab11a8b54cf29685b1f750cb130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6052936c0efa61d0821d103cb3d46488.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/eec8b398-9829-410e-826e-03ed28686ea7.png?resizew=228)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
(2)在点F运动过程中,是否存在某个x的值,使得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(3)若菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/712c7a83-5705-4484-a995-7dd5130923bb.png?resizew=235)
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【推荐1】将一个直角三角形纸片ABO放置在平面直角坐标系中,点A(
,0),B(0,1),O(0,0).
(1)点P为边OA上一点(点P不与A,O重合),沿BP将纸片折叠得A的对应点A′.边BA′与x轴交于点Q.
①如图1,当点A′刚好落在y轴上时,求点A′的坐标.
②如图2,当A′P⊥OA,若线段OQ在x轴上移动得到线段O′Q′(线段OQ平移时A′不动),当△A′O′Q′周长最小时,求OO′的长度.
(2)如图3,若点P为边AB上一点(点P不与A,B重合),沿OP将纸片折叠得A的对应点A″,当∠BPA″=30°时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)点P为边OA上一点(点P不与A,O重合),沿BP将纸片折叠得A的对应点A′.边BA′与x轴交于点Q.
①如图1,当点A′刚好落在y轴上时,求点A′的坐标.
②如图2,当A′P⊥OA,若线段OQ在x轴上移动得到线段O′Q′(线段OQ平移时A′不动),当△A′O′Q′周长最小时,求OO′的长度.
(2)如图3,若点P为边AB上一点(点P不与A,B重合),沿OP将纸片折叠得A的对应点A″,当∠BPA″=30°时,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/30ca8e2a-3c37-479e-bfba-7f083dfc4a6c.png?resizew=469)
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【推荐2】有一长方形纸带,E、F分别是边
,
上一点,
度(
),将纸带沿
折叠成图1,再沿
折叠成图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/ae85d019-5a4d-49ca-87ae-68594fc52a14.png?resizew=356)
(1)如图1,当
度时,
度;
(2)如图2,若
,求α的值;
(3)作
平分
交直线
与点P,请直接写出
与
的数量关系 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84d78261b991d43598f1497125376b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4238815f530f649275de714b7231f75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/ae85d019-5a4d-49ca-87ae-68594fc52a14.png?resizew=356)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e6d20b031011295484ff12686f1f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9322b0ae7e9b9585e4d1a1ee96f2d80a.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374a3641b9ebb8b5a55b41941339b9b8.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5634a208294350f8ec151cd19b6d3278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8157b068983c8eb06343b0ea67b93d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d7b232eb8c6085b5f6fd535c58c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341a2a0afd52868584c4208bf7284f89.png)
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【推荐3】综合与实践:数学课上,同学们以“等边三角形折叠”为主题开展数学活动.
(1)操作判断,操作一:将如图(1)所示的等边三角形纸片折叠,使点B和点C重合,得到折痕
,把纸片展开,如图(2);操作二:将如图(1)所示的等边三角形纸片折叠,分别使点B和点C重合,点A和点C重合,点A和点B重合,折叠三次,得到三条折痕
,
,
,三条折痕的相交于点O,把纸片展开,如图(3);若等边三角形的边长为4,根据以上操作,①
;②
;③
,这三种线段和中,线段和最小的是(填序号)________,最小值是 .
(2)迁移研究:小帅同学将等边三角形纸片换成等腰三角形纸片,继续研究,过程如下:将等腰三角形纸片
按照(1)中的操作二进行折叠,折痕交点为点O,把纸片展开,如图(4),若
,
,求点O到点A的距离.
(3)拓展应用:在等腰△ABC中,已知
,
的面积为10,点O到
三个顶点的距离相等,请直接写出点O到点A的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/49325bd2-5721-4c04-ace4-7241e0b4ec4c.png?resizew=471)
(1)操作判断,操作一:将如图(1)所示的等边三角形纸片折叠,使点B和点C重合,得到折痕
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6151fb896230f2579d516af4c67e634a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57041caba590305ccb37a3a7fbd2a14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62635ee088808196e070c44ba6c20fb.png)
(2)迁移研究:小帅同学将等边三角形纸片换成等腰三角形纸片,继续研究,过程如下:将等腰三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
(3)拓展应用:在等腰△ABC中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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