综合与实践
如图,
是等边三角形,
,在
内任作一个正方形
,点
在
上,点
在
内,边
在
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/8ce2a3ca-df57-4c0e-a1fc-541446e1c1fd.png?resizew=295)
(1)尺规作图:在图1中,以点
为位似中心,作正方形
的位似正方形
,点
在
边上,点
在
边上,点
在
边上(保留作图痕迹,不写作法);
(2)求(1)中作出的正方形
的边长;
(3)如图2,当
时,在
中再放入正方形
,点
在射线
上,点
在边
上,边
在边
上,直接写出这两个正方形面积和的最大值和最小值.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad52f4b9d2358525b29356f61ed25cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/8ce2a3ca-df57-4c0e-a1fc-541446e1c1fd.png?resizew=295)
(1)尺规作图:在图1中,以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59b7ac746d19826efce9dbc5cef9537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求(1)中作出的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59b7ac746d19826efce9dbc5cef9537.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37abd16ebc7075f3431ad728994cd34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7567b6373c91797dc0a881168786e43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
更新时间:2022-12-11 14:11:24
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相似题推荐
解答题-问答题
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解题方法
【推荐1】抛物线
的顶点为
,与
轴交于点
和
(点
在点
的右侧),与
轴交于点
,直线
是抛物线的对称轴.
(1)当
时,求顶点P的坐标;
(2)将抛物线向左平移1个单位长,向上平移2个单位长,所得抛物线的顶点
恰好与点C重合,求平移后所得抛物线的解析式;
(3)设E是直线
上的一点,F是直线
上的一点,若四边形
的三边
的最小值为5,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8580445c2a200ba9d6d68412f6ee2b6b.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
(2)将抛物线向左平移1个单位长,向上平移2个单位长,所得抛物线的顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
(3)设E是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eeca5ddb804f1128921703b97f8d315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知二次函数
.
(1)若
.
①当
时,求该函数图象的顶点坐标.
②不论
取何值,图象是否会经过定点?若会,请求出图象经过的定点坐标;若不会,请说明理由.
(2)点
,
在该函数图象上,且
.若
,图象的顶点在第三象限,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234e4e49286824aeec6ac9ccb08ebc35.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ec3d42cc0f2ce5aaf7682ded947a50.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
②不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2799abb64fd7bfce9dfa7228aa460564.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b335385838979e1744cb32542004c04f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3316464faa4c460d8ea308c194667a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df86b0da538701c08fb214608e062372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df7e635d8946dddfa3e677964f48f1d.png)
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【推荐1】【探究证明】
(1)某班数学课题学习小组对矩形内两条互相垂直的线段与矩形两邻边的数量关系进行探究,提出下列问题,请你给出证明.
如图1,矩形
中,
,
分别交
,
于点
,
,
分别交
,
于点
,
,求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/03ec882d-65ea-43f0-a3c5-ec11e46286fa.png?resizew=553)
【结论应用】
(2)如图2,在满足(1)的条件下,又
,点
,
分别在边
,
上,若
,则
的值为________;(直接写出结果)
【联系拓展】
(3)如图3,四边形
中,
,
,
,
,点
,
分别在边
,
上,求
的值.
(1)某班数学课题学习小组对矩形内两条互相垂直的线段与矩形两邻边的数量关系进行探究,提出下列问题,请你给出证明.
如图1,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de64cbea23ec8a57a4705d9f16297d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db61c8766cffeff04615177a78a4e6e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/03ec882d-65ea-43f0-a3c5-ec11e46286fa.png?resizew=553)
【结论应用】
(2)如图2,在满足(1)的条件下,又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7f786fc33d0506d64047034e12fd7a.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5317ae921ee20693807afb13a950c422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d42e47b9110ef86d38b4dce6f7194f.png)
【联系拓展】
(3)如图3,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4362edfc026266c5d29b3f90df374e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10a566d3e3ca2b1403371f5f8869fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf01f38e46346dab1337b422939e50ee.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f710f8f1fa0df203765d18692ded6a91.png)
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【推荐2】已知:矩形
中,
,
,将矩形顶点
沿
折叠,使
落在
上(不与
、
重合)的
处,点
、
分别在
、
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/a2e4b995-eff9-445e-878a-1a01b2ce9d8d.png?resizew=182)
(1)求证:
;
(2)若
时,
①求
的长度;
②求证:
平分
;
(3)若
,试求
的长.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/a2e4b995-eff9-445e-878a-1a01b2ce9d8d.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9072f6132f62108612f8d71538868c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12bf5313f0d9c88fb20eedbeb49a25f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c43dd388352759ed235659d3a3e0cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐1】【问题背景】
人教版九年级下册教材第58页第11题:如图1,一块材料的形状是锐角三角形
,边
,高
.把它加工成正方形零件,使正方形的一边在
上,其余两个顶点分别在
上,这个正方形零件的边长是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/aa33563a-7202-4eff-8b83-75175b521659.png?resizew=156)
【提出问题】
在满足正方形的一边在三角形的一边上,其余两个顶点分别在另外两边上的条件下,能否在上面的材料上,加工一个面积更大的正方形?如何用直角尺(只能画直角)和圆规画出这个正方形?
【分析问题】
小敏认为,由于正方形的一边在三角形的一边上,这样就存在三种可能.在已知三边长度的情况下,可以通过计算,分别求出三个正方形的边长,然后比较三条边长的大小,进而知道面积最大的正方形;也可以结合当前所学的位似,分别画出满足条件的正方形,再利用圆规比较三个正方形的边长的大小,即可解决问题.
【解决问题】
为了简化探索过程,小敏取边长分别为
的三个等腰三角形(其中
为腰)木块进行研究.
如图2,正方形
的顶点
分别在
上,边
在
上.如图3,正方形
的顶点
分别在
上,边
在
上.
请你完成下面两个问题:
(1)通过计算,比较这两个正方形的边长的大小;
(2)在图4中,用直角尺(只能画直角)和圆规画出面积最大的正方形,使其一边在三角形的一边上,其余两个顶点分别在另外两边上(保留画图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/d4bbea38-49e2-467e-8686-00803bd9784c.png?resizew=460)
【学以致用】
定义:由组成圆心角的两条半径和圆心角所对的弧围成的图形叫做扇形.
小敏类比上面的研究方法,又提出下面问题:
在如图5所示的扇形中,能否用直角尺和圆规画出一个正方形,使其两个顶点在弧上,另外两个顶点在半径上?
你认为可以吗?如果可以、在图中画出符合条件的正方形(保留画图痕迹);如果不可以,说明理由.
人教版九年级下册教材第58页第11题:如图1,一块材料的形状是锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf57eef2bac6f23b54d87bd128fac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b268b2129e91d0af3423f2c001653d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/aa33563a-7202-4eff-8b83-75175b521659.png?resizew=156)
【提出问题】
在满足正方形的一边在三角形的一边上,其余两个顶点分别在另外两边上的条件下,能否在上面的材料上,加工一个面积更大的正方形?如何用直角尺(只能画直角)和圆规画出这个正方形?
【分析问题】
小敏认为,由于正方形的一边在三角形的一边上,这样就存在三种可能.在已知三边长度的情况下,可以通过计算,分别求出三个正方形的边长,然后比较三条边长的大小,进而知道面积最大的正方形;也可以结合当前所学的位似,分别画出满足条件的正方形,再利用圆规比较三个正方形的边长的大小,即可解决问题.
【解决问题】
为了简化探索过程,小敏取边长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3316ca3617d26c77cd90f9d9cb8ecf19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c869892d803fdca5767b219cdc4bacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
请你完成下面两个问题:
(1)通过计算,比较这两个正方形的边长的大小;
(2)在图4中,用直角尺(只能画直角)和圆规画出面积最大的正方形,使其一边在三角形的一边上,其余两个顶点分别在另外两边上(保留画图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/d4bbea38-49e2-467e-8686-00803bd9784c.png?resizew=460)
【学以致用】
定义:由组成圆心角的两条半径和圆心角所对的弧围成的图形叫做扇形.
小敏类比上面的研究方法,又提出下面问题:
在如图5所示的扇形中,能否用直角尺和圆规画出一个正方形,使其两个顶点在弧上,另外两个顶点在半径上?
你认为可以吗?如果可以、在图中画出符合条件的正方形(保留画图痕迹);如果不可以,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/573a0eee-7bf3-4fb0-8f27-fb4de1e29780.png?resizew=93)
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【推荐2】如图,抛物线y=ax2+bx+3与x轴交于点A(﹣1,0),点B(3,0),抛物线的顶点为C.
(1)求抛物线的函数表达式;
(2)连接AC、BC.问:是否存在这样的点P,以P为位似中心,将△ABC放大为原来的2倍后得到△DEF(即点A、B、C的对应点分别是点D、E、F),使得点D、E恰好在抛物线上且点F在抛物线的对称轴上?若存在,请求出符合条件的点P的坐标;若不存在,请说明理由.
(1)求抛物线的函数表达式;
(2)连接AC、BC.问:是否存在这样的点P,以P为位似中心,将△ABC放大为原来的2倍后得到△DEF(即点A、B、C的对应点分别是点D、E、F),使得点D、E恰好在抛物线上且点F在抛物线的对称轴上?若存在,请求出符合条件的点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873946673496064/2875822867136512/STEM/8c550abf0d9742919ef91fa9fbb132ef.png?resizew=163)
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【推荐1】已知,矩形
中,点
在
上,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/3f3ca83a-25b1-4a01-bb2b-9ed946f07cdf.png?resizew=314)
(1)若
于点
,如图
.
证明:
;
若
,求
的度数;
(2)若
,点
是
的中点,连接
,如图
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/editorImg/2024/1/22/3f3ca83a-25b1-4a01-bb2b-9ed946f07cdf.png?resizew=314)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b87b3be10408261827291574434d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5819e5650ae6c524a7cc96b433f2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199fbe28a7249636cb253ce8e446dd32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd45266ec7a72012b8f2cb34dec4f994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa00db690a346fa344daf3d28e50f8ac.png)
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【推荐2】如图,已知半圆O的直径
,C是圆外一点,
的平分线交半圆O于点D,且
,联结
交
于点E.
时,求
的长;
(2)当
时,求
的值;
(3)当
为直角三角形时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac117d79db75ce7f945bdc43c25b8d9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f0dc17db5fcc83b204dc845447ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3715ede799ef1b110c89c30ba88f67.png)
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