如图,在
中,
,射线
.点P从点A出发,沿
以每秒
的速度向终点B运动.过点P作
交射线
于点Q,以
为一边向上作正方形
,设点P的运动时间为t(秒):
![](https://img.xkw.com/dksih/QBM/2023/4/14/3216181358379008/3227672503115776/STEM/2bdc225dd8024f768d722b6fec915feb.png?resizew=550)
(1)如图1,当点Q与点D重合时,求正方形
的面积;
(2)如图2,作点D关于直线
的对称点
,连接
.
①当点P从点A运动到
的中点时,求点
的运动路径长;
②当
与
的边垂直或平行时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b359c5b1cac50f65cf5a8621836afda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbeb58cc8b822861bba02cf7949184f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c6e55bca72a472f3bedf5896d6139b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://img.xkw.com/dksih/QBM/2023/4/14/3216181358379008/3227672503115776/STEM/2bdc225dd8024f768d722b6fec915feb.png?resizew=550)
(1)如图1,当点Q与点D重合时,求正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(2)如图2,作点D关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4171e7f713d6b265d56b2662b7af57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be451ce5fad246389ccf4864929d81d.png)
①当点P从点A运动到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be451ce5fad246389ccf4864929d81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
更新时间:2023-04-30 14:59:25
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【推荐1】如图,二次函数
的图象与x轴交于点A和B,点A在点B的左侧,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/072e4151-9128-457f-9e5b-407233638144.png?resizew=273)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/96f6d028-25b1-4873-8186-babe4cad367b.png?resizew=271)
(1)求直线
的函数解析式;
(2)如图2,点D在直线
下方的抛物线上运动,过点D作
轴交
于点M,作
于点N,当
的周长最大时,求点D的坐标及
周长的最大值;
(3)以
为边作
交y轴于点E,借助图1探究,并直接写出点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f892f4fe7bd006460292f240f1f2f54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/072e4151-9128-457f-9e5b-407233638144.png?resizew=273)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/96f6d028-25b1-4873-8186-babe4cad367b.png?resizew=271)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94eae0a665bfa43b1ecbaff1d38cb7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b910d57a6bb68c737d85ced512464fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
(3)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba4c2b1162042e43e5081c7a2d3fda.png)
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【推荐2】如图,抛物线y=﹣
x2
x+4交x轴于A,B两点(点B在A的右边),与y轴交于点C,连接AC,BC.点P是第一象限内抛物线上的一个动点,点P的横坐标为m,过点P作PM⊥x轴,垂足为点M,PM交BC于点Q.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978325102854144/2979775762915328/STEM/2be0aab8-9d11-4318-8d0d-70740ea67b1d.png?resizew=225)
(1)求A、B两点坐标;
(2)过点P作PN上BC,垂足为点N,请用含m的代数式表示线段PN的长,并求出当m为何值时PN有最大值,最大值是多少?
(3)试探究点P在运动过程中,是否存在这样的点Q,使得以A,C,Q为顶点的三角形是等腰三角形.若存在,请求出此时点Q的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312cfa86e279c6e07d16959f8b18ad75.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978325102854144/2979775762915328/STEM/2be0aab8-9d11-4318-8d0d-70740ea67b1d.png?resizew=225)
(1)求A、B两点坐标;
(2)过点P作PN上BC,垂足为点N,请用含m的代数式表示线段PN的长,并求出当m为何值时PN有最大值,最大值是多少?
(3)试探究点P在运动过程中,是否存在这样的点Q,使得以A,C,Q为顶点的三角形是等腰三角形.若存在,请求出此时点Q的坐标,若不存在,请说明理由.
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名校
【推荐1】【模型引入】
我们在全等学习中所总结的“一线三等角、K型全等”这一基本图形,可以使得我们在观察新问题的时候很迅速地联想,从而借助已有经验,迅速解决问题.
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/8db7c30d-5dd0-4818-8bb9-faf9eb0a578b.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/3b56e469-9fc0-4b5d-908f-c5a2d7520927.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/f69b497b-768f-4488-8296-635abbcdbdab.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/15389137-4c9d-4274-bd64-82d3cf571ce9.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/a00b508a-a0b4-42a0-9cd3-b0d04af7e0c7.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/d7b86100-682a-4901-847d-3bd61cc937cd.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/0e91777a-c9ea-43d1-ab20-d5fab6292289.png?resizew=231)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/eae43f8f-9139-4176-a230-eedc08f0a18f.png?resizew=175)
【模型探究】
如图,正方形ABCD中,E是对角线BD上一点,连接AE,过点E作EF⊥AE,交直线CB于点F.
(1)如图1,若点F在线段BC上,写出EA与EF的数量关系并加以证明;
(2)如图2,若点F在线段CB的延长线上,请直接写出线段BC,BE和BF的数量关系.
【模型应用】
(3)如图3,正方形ABCD中,AB=4,E为CD上一动点,连接AE交BD于F,过F作FH⊥AE于F,过H作HG⊥BD于G.则下列结论:①AF=FH;②∠HAE=45°;③BD=2FG;④△CEH的周长为8.正确的结论有 个.
(4)如图4,点E是正方形ABCD对角线BD上一点,连接AE,过点E作EF⊥AE,交线段BC于点F,交线段AC于点M,连接AF交线段BD于点H.给出下列四个结论,①AE=EF;②
DE=CF;③S△AEM=S△MCF;④BE=DE+
BF;正确的结论有 个.
【模型变式】
(5)如图5,在平面直角坐标系中,四边形OBCD是正方形,且D(0,2),点E是线段OB延长线上一点,M是线段OB上一动点(不包括点O、B),作MN⊥DM,垂足为M,交∠CBE的平分线与点N,求证:MD=MN
(6)如图6,在上一问的条件下,连接DN交BC于点F,连接FM,则∠FMN和∠NMB之间有怎样的数量关系?请给出证明.
【拓展延伸】
(7)已知∠MON=90°,点A是射线ON上的一个定点,点B是射线OM上的一个动点,且满足OB>OA.点C在线段OA的延长线上,且AC=OB.如图7,在线段BO上截取BE,使BE=OA,连接CE.若∠OBA+∠OCE=β,当点B在射线OM上运动时,β的大小是否会发生变化?如果不变,请求出这个定值;如果变化,请说明理由.
(8)如图8,正方形ABCD中,AD=6,点E是对角线AC上一点,连接DE,过点E作EF⊥ED,交AB于点F,连接DF,交AC于点G,将△EFG沿EF翻折,得到△EFM,连接DM,交EF于点N,若点F是AB边的中点,则△EDM的面积是 .
我们在全等学习中所总结的“一线三等角、K型全等”这一基本图形,可以使得我们在观察新问题的时候很迅速地联想,从而借助已有经验,迅速解决问题.
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/8db7c30d-5dd0-4818-8bb9-faf9eb0a578b.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/3b56e469-9fc0-4b5d-908f-c5a2d7520927.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/f69b497b-768f-4488-8296-635abbcdbdab.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/15389137-4c9d-4274-bd64-82d3cf571ce9.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/a00b508a-a0b4-42a0-9cd3-b0d04af7e0c7.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/d7b86100-682a-4901-847d-3bd61cc937cd.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/0e91777a-c9ea-43d1-ab20-d5fab6292289.png?resizew=231)
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843800689311744/2844062223376384/STEM/eae43f8f-9139-4176-a230-eedc08f0a18f.png?resizew=175)
【模型探究】
如图,正方形ABCD中,E是对角线BD上一点,连接AE,过点E作EF⊥AE,交直线CB于点F.
(1)如图1,若点F在线段BC上,写出EA与EF的数量关系并加以证明;
(2)如图2,若点F在线段CB的延长线上,请直接写出线段BC,BE和BF的数量关系.
【模型应用】
(3)如图3,正方形ABCD中,AB=4,E为CD上一动点,连接AE交BD于F,过F作FH⊥AE于F,过H作HG⊥BD于G.则下列结论:①AF=FH;②∠HAE=45°;③BD=2FG;④△CEH的周长为8.正确的结论有 个.
(4)如图4,点E是正方形ABCD对角线BD上一点,连接AE,过点E作EF⊥AE,交线段BC于点F,交线段AC于点M,连接AF交线段BD于点H.给出下列四个结论,①AE=EF;②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
【模型变式】
(5)如图5,在平面直角坐标系中,四边形OBCD是正方形,且D(0,2),点E是线段OB延长线上一点,M是线段OB上一动点(不包括点O、B),作MN⊥DM,垂足为M,交∠CBE的平分线与点N,求证:MD=MN
(6)如图6,在上一问的条件下,连接DN交BC于点F,连接FM,则∠FMN和∠NMB之间有怎样的数量关系?请给出证明.
【拓展延伸】
(7)已知∠MON=90°,点A是射线ON上的一个定点,点B是射线OM上的一个动点,且满足OB>OA.点C在线段OA的延长线上,且AC=OB.如图7,在线段BO上截取BE,使BE=OA,连接CE.若∠OBA+∠OCE=β,当点B在射线OM上运动时,β的大小是否会发生变化?如果不变,请求出这个定值;如果变化,请说明理由.
(8)如图8,正方形ABCD中,AD=6,点E是对角线AC上一点,连接DE,过点E作EF⊥ED,交AB于点F,连接DF,交AC于点G,将△EFG沿EF翻折,得到△EFM,连接DM,交EF于点N,若点F是AB边的中点,则△EDM的面积是 .
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【推荐2】如图,正方形
的边长为4,点
是正方形内部一点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352fa935d7eeb2bb39c20868030c601f.png)
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【推荐3】问题提出:
(1)如图1,正方形ABCD的边长为4,对角线AC,BD交于点O.若点P是对角线BD上任意一点,则线段AP长的取值范围是 _____;
问题探究:
(2)如图2,若点P是△ABC内任意一点,点M,N分别是AB边和对角线AC上的两个动点,则当AP的值在(1)中的取值范围内变化时,△PMN的周长是否存在最小值?若存在,求出△PMN周长的最小值;若不存在,请说明理由;
问题解决:
(3)如图3,正方形ABCD边长为4,点P是△ABC内任意一点,且AP=4,点M,N分别是AB边和对角线AC上的两个动点,则当△PMN的周长取到最小值时,求四边形AMPN面积的最大值.
(1)如图1,正方形ABCD的边长为4,对角线AC,BD交于点O.若点P是对角线BD上任意一点,则线段AP长的取值范围是 _____;
问题探究:
(2)如图2,若点P是△ABC内任意一点,点M,N分别是AB边和对角线AC上的两个动点,则当AP的值在(1)中的取值范围内变化时,△PMN的周长是否存在最小值?若存在,求出△PMN周长的最小值;若不存在,请说明理由;
问题解决:
(3)如图3,正方形ABCD边长为4,点P是△ABC内任意一点,且AP=4,点M,N分别是AB边和对角线AC上的两个动点,则当△PMN的周长取到最小值时,求四边形AMPN面积的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/7b9037b3-ceee-43bc-a6b8-12a39547b99d.png?resizew=520)
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【推荐1】在等边
中,点D,E分别在边AB,BC上运动,以DE为边向右作等边
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/1d03db78-3cad-4d7e-9558-4e7a191f3f6e.png?resizew=342)
(1)如图1,求证:
;
(2)如图1,连接CF,请你从下列三个选项中,任选一个作为条件,另一个作为结论,组成一个真命题,并加以证明;①
;②CF平分
;③AD,BE,CF三条线段构成以AD为斜边的直角三角形.
(3)如图2,
,连接AF,BF当
取得最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733b5aa50f82b4610fd48e344431d7db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/1d03db78-3cad-4d7e-9558-4e7a191f3f6e.png?resizew=342)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56e79a7412a1c5159979295dd62bbd7.png)
(2)如图1,连接CF,请你从下列三个选项中,任选一个作为条件,另一个作为结论,组成一个真命题,并加以证明;①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8dffd659bc657c01cb8cf07591d805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
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解题方法
【推荐2】如图,二次函数
的图象过点
,
两点.
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520547566747648/2520704711098368/STEM/5aa64d5dc00f4684ae16cc118067db59.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520547566747648/2520704711098368/STEM/633818574cbb4085a596fc0189ea6cef.png?resizew=204)
(1)求二次函数
的表达式;
(2)如图,动点
从
出发,在线段
上沿
的方向运动,同时动点
也从
出发,在线段
上沿
的方向运动,两点的速度都是每秒
个单位,当点
与
重合时,
、
两点同时停止运动,过点
作
于点
,连接
、
,将
沿直线
折叠得到
,在运动过程中,设时间为
(秒).当点
恰好落在抛物线上时,求
的值.
(3)点
在抛物线上,连接
,
得到
,是否存在点
,使
的
或
中有一个角为
,若存在,请直接写出相应的点
的坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2b1f4120365cb6ee4925fe417563f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520547566747648/2520704711098368/STEM/5aa64d5dc00f4684ae16cc118067db59.png?resizew=207)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520547566747648/2520704711098368/STEM/633818574cbb4085a596fc0189ea6cef.png?resizew=204)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
(2)如图,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169ccf0e6e7ada48126feac1e67de0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31940149def6907c303bb48f25fd6bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52784d9fdfb3ec1f7bf8dcd2be73d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051830491e8010d8bf28e8a7630c36b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0023e53eafba27ad50f9a9d3a4207d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135ce1e511ca8c19107d83e6aef598e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解答题-证明题
|
困难
(0.15)
【推荐1】探究题
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/67b74df5-e65e-4a58-8066-ba76a9d2515d.png?resizew=520)
(1)知识储备
①如图1,已知点P为等边△ABC外接圆的弧BC上任意一点.求证:PB+PC=PA.
②定义:在△ABC所在平面上存在一点P,使它到三角形三顶点的距离之和最小,则称点P为△ABC的费马点,此时PA+PB+PC的值为△ABC的费马距离.
(2)知识迁移
我们有如下探寻△ABC(其中∠A,∠B,∠C均小于120°)的费马点和费马距离的方法:如图2,在△ABC的外部以BC为边长作等边△BCD及其外接圆,根据(1)的结论,易知线段____的长度即为△ABC的费马距离.
(3)知识应用
①如图3所示的△ABC(其中
均小于
),
,现取一点P,使点P到
三点的距离之和最小,求最小值;
②如图4,若三个村庄
构成Rt△ABC,其中
.现选取一点P打水井,使P点到三个村庄
铺设的输水管总长度最小,画出点P所对应的位置,输水管总长度的最小值为________.(直接写结果)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/67b74df5-e65e-4a58-8066-ba76a9d2515d.png?resizew=520)
(1)知识储备
①如图1,已知点P为等边△ABC外接圆的弧BC上任意一点.求证:PB+PC=PA.
②定义:在△ABC所在平面上存在一点P,使它到三角形三顶点的距离之和最小,则称点P为△ABC的费马点,此时PA+PB+PC的值为△ABC的费马距离.
(2)知识迁移
我们有如下探寻△ABC(其中∠A,∠B,∠C均小于120°)的费马点和费马距离的方法:如图2,在△ABC的外部以BC为边长作等边△BCD及其外接圆,根据(1)的结论,易知线段____的长度即为△ABC的费马距离.
(3)知识应用
①如图3所示的△ABC(其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee60666ac6d62d11c3c9400a436e695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47517cbc34ee046702bd73a7f8433279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
②如图4,若三个村庄
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ed8d8e301363d1b6f4ea1fe93db9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
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困难
(0.15)
【推荐2】如图,已知四边形
中,
,
,
,
.点E、F分别为
上的动点(E不与A、D重合),且
,将四边形
沿直线
翻折得四边形
,其中C、D的对应点分别是
、
.
(1)当E为
中点时,
__________;
(2)当点B、
、E在同一直线上时,求证:
是等边三角形;
(3)连接
、
,当
是直角三角形时,求
的长.
![](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/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8745717601cd14b46c2298919b41b502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78e03251a5de00fe4b8684cd258d4d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a71541ee1106b3e3ff92be1d4b8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
(1)当E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bba34a9de8b751f8723da380f32f578.png)
(2)当点B、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50c65bc93d8e6492a3eeabf97fe73b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
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困难
(0.15)
名校
【推荐3】等边
中,点
为直线
上一动点,连接
.
(1)如图1,在平面内将线段
绕点
顺时针方向旋转
得到线段
,连接
.若
点在
边上,且
,
,求
的长度;
(2)如图2,若点
在
延长线上,点
为线段
上一点,点
在
延长线上,连接
、
.在点
的运动过程中,若
,且
,猜想线段
与线段
之间的数量关系,并证明你的猜想;
(3)如图3,将
沿直线
翻折至
所在平面内得到
,
点在
边上,且
,将
绕点
逆时针方向旋转
得到线段
,点
是直线
上一动点,将
沿直线
翻折至
所在平面内得到
,在点
,
运动过程中,当
最小时,若
,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/4cc9575f-2501-4dda-9e6e-1f9afaf30cd1.png?resizew=496)
(1)如图1,在平面内将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29b0c53e1ac57d3129fdfa07a1f705b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fe89d7f8828f6d76dbfd167bb881e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379af16289cbc583be0803aa21718952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98028a4a1f50308d06e688ec63270ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafeab996376c817a6c8022ce6a63e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b822c51345a72700a6562d04be6e750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51160eaaac5c9d27e7849ece1f01746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84288b493b64c3a30466fb9075621da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4cb4069a2e1e90d1a9c4979ad09ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40304b883f3d23bbf066bc0af3c09862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe748ca5f19ce6e5ce601d1f889fd92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40304b883f3d23bbf066bc0af3c09862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192eb3037a663dea6057b76ee98e6413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b012deb3430609451b05868b9dff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3f9420b6771604e3bb9e86ee8ad3c8.png)
您最近一年使用:0次