在如图所示的平面直角坐标系中,正方形
边长为2,点C的坐标为
.
边上,将
沿直线
折叠,点B落在点
处,连接
并延长,交
于点E.
①当
时,点D的坐标是______;
②若点E是线段
的中点,求此时点D与点
的坐标;
(2)如图2,动点D,G分别在边
上,将四边形
沿直线
折叠,使点B的对应点
始终落在边
上(点
不与点O,A重合),点C落在点
处,
交
于点E.设
,四边形
的面积为S,直接写出S与t的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9040cff7e9e20dd2817ad9888237d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc387da3c10d0ffde2a41a935cc1331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174372a5a4b8116bf55bb6746401afd5.png)
②若点E是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
(2)如图2,动点D,G分别在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3cfb07926f1202a2574d3d0ce59749f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db1150b3412830a3ac67975543e8dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08359339c92eda08ae213e435d8182c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4000b743cfd6f12f52330fcb3a209229.png)
更新时间:2024-05-22 21:48:42
|
相似题推荐
解答题-问答题
|
困难
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解题方法
【推荐1】在平面直角坐标系中,直线y=x+3与x轴交于点A,与y轴交于点B,抛物线y=a
+bx+c(a<0)经过点A,B,
![](https://img.xkw.com/dksih/QBM/2020/1/11/2381364120559616/2439235818217472/STEM/364db6cb94284bea8bd3a114aa6e34f2.png?resizew=184)
(1)求a、b满足的关系式及c的值,
(2)当x<0时,若y=a
+bx+c(a<0)的函数值随x的增大而增大,求a的取值范围,
(3)如图,当a=−1时,在抛物线上是否存在点P,使△PAB的面积为
?若存在,请求出符合条件的所有点P的坐标;若不存在,请说明理由,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://img.xkw.com/dksih/QBM/2020/1/11/2381364120559616/2439235818217472/STEM/364db6cb94284bea8bd3a114aa6e34f2.png?resizew=184)
(1)求a、b满足的关系式及c的值,
(2)当x<0时,若y=a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
(3)如图,当a=−1时,在抛物线上是否存在点P,使△PAB的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
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【推荐2】【探索发现】如图1,等腰直角三角形
中,
,
,直线
经过点
,过
作
于点
.过
作
于点
,则
,我们称这种全等模型为“
型全等”.(不需要证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/894ce070-faf8-4327-85f4-04911cc2d127.png?resizew=669)
【迁移应用】已知:直线
的图像与
轴、
轴分别交于
、
两点.
(1)如图2,当
时,在第一象限构造等腰直角
,
;
①直接写出
______,
______;
②点
的坐标______;
(2)如图3,当
的取值变化,点
随之在
轴负半轴上运动时,在
轴左侧过点
作
,并且
,连接
,问
的面积是否发生变化?若不变,求出
面积;若变,请说明理由;
(3)【拓展应用】如图4,当
时,直线
:
与
轴交于点
,点
、
分别是直线
和直线
上的动点,点
在
轴上的坐标为
,当
是以
为斜边的等腰直角三角形时,点
的坐标是______(直接写出答案即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323b786e35c9b762d00f2b2ef74ce1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172d93e9195e92d7924c0aea3d4c7eaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/894ce070-faf8-4327-85f4-04911cc2d127.png?resizew=669)
【迁移应用】已知:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff30199b934846f18727f481b2b9ce68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7960bba587cd1a6f3f448fef80272435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b405a122ded2eb0395d5434892ae7b45.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a548e8a2e2205f2faa87e25180a083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6365fc0aa8fe555744500b7136a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4732bc8d79c547fe41937a47604028b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf2b5e712b42f748a3c30bb5d160c18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf2b5e712b42f748a3c30bb5d160c18.png)
(3)【拓展应用】如图4,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77904ca5beda48173e572dc06d9b5aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6280959e386eed67ce5d6f8da5dcdc.png)
![](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/91aea92f4e11ad78e2011a017ebdc841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64287eff8c1d7594ad04611f6604841b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51ece6bb53c3f5bf2da7d9ee5960e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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名校
解题方法
【推荐3】如图1,直线AB分别与x轴、y轴交于A、B两点,已知A(m,0),B(0,n),且m、n满足
.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901308916072448/2903436197339136/STEM/0af4280e-cd6b-4878-a241-06075f299e63.png?resizew=528)
(1)求A、B两点的坐标;
(2)如图2,若点C在第一象限,∠ACB=90°,AC=BC,点D为边AB中点,以点D为顶点的直角∠EDF两边分别交边BC于E,交边AC于F,求四边形EDFC的面积;
(3)如图3,若点C在y轴的正半轴上,H是第一象限内的一点,且H点的横、纵坐标始终相等,点P(x,
)为直线AB上一点,∠HCP=90°,HC=CP,当点P在x轴下方时,求出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962be3d55f7c9294b7afa5d916aeeb24.png)
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901308916072448/2903436197339136/STEM/0af4280e-cd6b-4878-a241-06075f299e63.png?resizew=528)
(1)求A、B两点的坐标;
(2)如图2,若点C在第一象限,∠ACB=90°,AC=BC,点D为边AB中点,以点D为顶点的直角∠EDF两边分别交边BC于E,交边AC于F,求四边形EDFC的面积;
(3)如图3,若点C在y轴的正半轴上,H是第一象限内的一点,且H点的横、纵坐标始终相等,点P(x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88262e9cc8b350920b1ae5aa87af2a89.png)
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解答题-作图题
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【推荐1】已知
和线段l,线段h.使用直尺和圆规作出满足下列条件的三角形(写出作法 ,保留作图痕迹).
,使得
,周长等于线段l;
(2)求作
,使得
,
一边上的高等于线段h,周长等于线段l.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a32de1e699d4e3877f518d50d3ffbc.png)
(2)求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a32de1e699d4e3877f518d50d3ffbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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【推荐2】如图,在
中,
,
,
.动点P从点A出发,沿
以每秒5个单位长度的速度向终点B运动,当点P不与点A重合时,过点P作
于点D、
,过点D作
,
与
交于点E.设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2969404030304256/3011527626776576/STEM/654db85e2900447aa29729f38bb2d1f0.png?resizew=181)
(1)线段
的长为______;(用含t的代数式表示)
(2)当点E落在
边上时,求t的值;
(3)当直线
将
的面积分成
的两部分时,求t的值;
(4)若线段
的中点为Q,当点Q落在
一边垂直平分线上时,直接写出t的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951b9f77413d5f062acb300b09de1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d0157310b49104bd2f604b4f83ecd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2969404030304256/3011527626776576/STEM/654db85e2900447aa29729f38bb2d1f0.png?resizew=181)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
(2)当点E落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d13cb88a171eb65ab8610b10ee0d1.png)
(4)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐3】如图,在△ABC中,AB=AC=10cm,BD⊥AC于点D,且BD=8cm.点M从点A出发,沿AC的方向匀速运动,速度为2cm/s;同时直线PQ由点B出发,沿BA的方向匀速运动,速度为1cm/s,运动过程中始终保持PQ
AC,直线PQ交AB于点P、交BC于点Q、交BD于点F,连接PM,设运动时间为t秒(0<t<5).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/16212a9a-f6cd-4db7-992c-cbbf1969639b.png?resizew=183)
(1)当t为何值时,△APM与△ACB相似?
(2)设四边形PQCM的面积为y
,求y与t之间的函数关系式;
(3)连接PC,是否存在某一时刻t,使点M在线段PC的垂直平分线上?若存在,求出此时t的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/16212a9a-f6cd-4db7-992c-cbbf1969639b.png?resizew=183)
(1)当t为何值时,△APM与△ACB相似?
(2)设四边形PQCM的面积为y
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
(3)连接PC,是否存在某一时刻t,使点M在线段PC的垂直平分线上?若存在,求出此时t的值;若不存在,说明理由.
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=50cm,BC=30cm,AC=40cm.
(1)求证:∠ACB=90°
(2)求AB边上的高.
(3)点D从点B出发在线段AB上以2cm/s的速度向终点A运动,设点D的运动时间为t(s).
①BD的长用含t的代数式表示为 .
②当△BCD为等腰三角形时,直接写出t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/969761cf-5eb1-4e5d-bebf-a63bdb9fc925.png?resizew=149)
(1)求证:∠ACB=90°
(2)求AB边上的高.
(3)点D从点B出发在线段AB上以2cm/s的速度向终点A运动,设点D的运动时间为t(s).
①BD的长用含t的代数式表示为 .
②当△BCD为等腰三角形时,直接写出t的值.
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【推荐2】阅读下面材料:
子薇遇到这样一个问题:如图1,在正方形
中,点
、
分别为
、
边上的点,
,连接
,求证:
.子薇是这样思考的:要想解决这个问题,首先应想办法将这些分散的线段集中到同一条线段上.他先后尝试了平移、翻折、旋转的方法,发现通过旋转可以解决此问题.他的方法是将
绕点
顺时针旋转
得到
(如图2),此时
即是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/e6a3e2b8-7b86-4290-a8db-59cd644fcd32.png?resizew=493)
请回答:在图2中,
的度数是 .
参考子薇得到的结论和思考问题的方法,解决下列问题:
(1)如图3,在直角梯形ABCD中,
,
,
,E是CD上一点,若
,
,求BE的长度.
(2)如图4,已知线段
,线段
绕点
旋转,且
,连接
,以
为边作正方形
,连接
.求线段
的最大值.
子薇遇到这样一个问题:如图1,在正方形
![](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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99627df7b1a88b9bf3dda20390d245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](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/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4eef107fa9d4cedabdf5906c627cce5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/e6a3e2b8-7b86-4290-a8db-59cd644fcd32.png?resizew=493)
请回答:在图2中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f9f70b2bf8747fb27c7ca1ae7cdea4.png)
参考子薇得到的结论和思考问题的方法,解决下列问题:
(1)如图3,在直角梯形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820a5967922f6b02405789a4e9608891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5a38c27c3111dfd51b49de5b2e27fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f12c8e863e2661cb4a4b4138b06101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
(2)如图4,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】(1)感知:如图①所示,在正方形
中,
为
上一点,将
沿
翻折到
处,延长
交
边于
点,当点
在
上移动时,
的大小________.(填“变化”或“不变”);
(2)探究:如图②,在矩形
中,
为
上一点,且
,
,将
沿
翻折到
处,延长
交
边于
点,延长
交
边于点
,且
,求
的长.
(3)拓展:如图③,在菱形
中,
,
为
的三等分点,
,将
沿
翻折得到
,直线
交直线
于点
,请直接写出
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85bcd207e761df740d87a6acb81bf7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29f9f4fb55def567f40a93a87f466c9.png)
(2)探究:如图②,在矩形
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164a4df60a15587971e883cf557b5ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85bcd207e761df740d87a6acb81bf7a.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f46b6b3841a2e590438cdf030dd81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展:如图③,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】如图,边长为6的正方形ABCD中,E为AB中点,P为BC上一点(不与B、C重合),将△BPE沿直线PE翻折,点B落在B' 处,直线PB'交射线AD于点Q,连接EQ,设BP=a.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011639021568/2982590243438592/STEM/8bbfcf7c-29cb-4189-aeed-c7b7a53ee5d6.png?resizew=421)
(1)求证:∠PEQ=90°;
(2)设
的值为y,用含a的代数式表示y并求出y的最大值;
(3)若F为BC中点,设过点F且垂直于BC的直线被直角三角形PEQ截得的线段长为d,请直接写出d与a的关系式.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982011639021568/2982590243438592/STEM/8bbfcf7c-29cb-4189-aeed-c7b7a53ee5d6.png?resizew=421)
(1)求证:∠PEQ=90°;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e568f3d9d38a12ed3346b743b5120b4.png)
(3)若F为BC中点,设过点F且垂直于BC的直线被直角三角形PEQ截得的线段长为d,请直接写出d与a的关系式.
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【推荐3】问题情境
在综合实践课上,同学们以“正方形和直线的旋转”为主题分组开展数学探究活动,已知正方形ABCD,直线PQ经过点A,并绕点A旋转,作点B关于直线PQ的对称点E,直线DE交直线PQ于点F,连结AE,BE.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480956494127104/2481753503170560/STEM/0de25f6a5c494099a7754be2d50e5bb8.png?resizew=355)
操作发现
(1)如图1,设∠PAB=25°则∠ADF= °.
(2)“梦想小组”的同学们发现,∠BEF的度数是一个定值,这个值为 .
(3)“创新小组”的同学们发现,线段AB、DF、EF之间存在特殊的数量关系,请写出这一关系式,并说明理由:
拓展应用
(4)如图2,当直线PQ在正方形ABCD的外部时,“进取小组”的同学们发现(3)的结论仍然成立,并提出新问题;若DF=3
,EF=4
,直接写出正方形ABCD的边长.
在综合实践课上,同学们以“正方形和直线的旋转”为主题分组开展数学探究活动,已知正方形ABCD,直线PQ经过点A,并绕点A旋转,作点B关于直线PQ的对称点E,直线DE交直线PQ于点F,连结AE,BE.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480956494127104/2481753503170560/STEM/0de25f6a5c494099a7754be2d50e5bb8.png?resizew=355)
操作发现
(1)如图1,设∠PAB=25°则∠ADF= °.
(2)“梦想小组”的同学们发现,∠BEF的度数是一个定值,这个值为 .
(3)“创新小组”的同学们发现,线段AB、DF、EF之间存在特殊的数量关系,请写出这一关系式,并说明理由:
拓展应用
(4)如图2,当直线PQ在正方形ABCD的外部时,“进取小组”的同学们发现(3)的结论仍然成立,并提出新问题;若DF=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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