如图,在
中,
,在
上截取
,连接
,过点
作
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858118936010752/2860452690329600/STEM/0dcdb0d3-13d1-410e-ad13-a27ec5efaaee.png)
(1)如图1,若
为
边的中点,且
,
,求线段
的长度.
(2)如图2,过点
作
于点
,延长
交
于点
,连接
,若
,求证:
.
(3)如图3,过点
作
于点
,把
绕点
顺时针旋转,记旋转后的
为
,过点
作直线
交
于点
,连接
.当
时,直接写出线段
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e12457d5b7d0f2611f4cdc173ceb784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/11/24/2858118936010752/2860452690329600/STEM/0dcdb0d3-13d1-410e-ad13-a27ec5efaaee.png)
(1)如图1,若
![](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/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c334350df9be155b169fc3784b08532b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8682ff8b31c948592a7b60bd0665cf0.png)
(3)如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c334350df9be155b169fc3784b08532b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1975abdfba3d89ee75a40e4239f6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1975abdfba3d89ee75a40e4239f6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0872acef52103f75f7d31d23f5f694ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc5beaf818bf9ada2c11a50bf615e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6032f11b7d1a56245279a831eaab079a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
更新时间:2021-11-27 19:08:48
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】把△ABC绕着点A逆时针旋转
,得到△ADE.
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945715679232/2510439486373888/STEM/d6d4ce19e79f4e759d05fd4aa9405671.png?resizew=164)
(1)如图1,当点B恰好在ED的延长线上时,若
,求∠ABC的度数;
(2)如图2,当点C恰好在ED的延长线上时,求证:CA平分∠BCE;
(3)如图3,连接CD,如果DE=DC,连接EC与AB的延长线交于点F,直接写出∠F的度数(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945715679232/2510439486373888/STEM/18c9644491df49c4b759341cdeef1888.png?resizew=110)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945715679232/2510439486373888/STEM/dc6d30edc2714a3e9e278a95477180eb.png?resizew=182)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2509945715679232/2510439486373888/STEM/d6d4ce19e79f4e759d05fd4aa9405671.png?resizew=164)
(1)如图1,当点B恰好在ED的延长线上时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
(2)如图2,当点C恰好在ED的延长线上时,求证:CA平分∠BCE;
(3)如图3,连接CD,如果DE=DC,连接EC与AB的延长线交于点F,直接写出∠F的度数(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】如图,AB为⊙O的直径,延长AB至点D,CD切⊙O于点C,点B是
的中点,弦CF交AB于点E,连结OF、BC,过B点作BG⊥CD于点G.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2973001547849728/2974841527148544/STEM/f79ea512-a7f1-43b5-b4be-2c473f38e19e.png?resizew=208)
(1)若∠BCD=28°,求∠F的度数.
(2)若CF=4OE,⊙O的半径为
,求BG的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44635d621f25efe7ae6cd574ac480212.png)
![](https://img.xkw.com/dksih/QBM/2022/5/5/2973001547849728/2974841527148544/STEM/f79ea512-a7f1-43b5-b4be-2c473f38e19e.png?resizew=208)
(1)若∠BCD=28°,求∠F的度数.
(2)若CF=4OE,⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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【推荐3】(1)问题背景:
如图1:在四边形
中,
,
,
,E、F分别是
上的点且
,探究图中线段
之间的数量关系.小王同学探究此问题的方法是,延长
到点G,使
,连接
,先证
,再证明
可得出结论,他的结论应是______;
(2)探索延伸:如图2,若在四边形
中,
,E、F分别是
上的点,且
,上述结论是否仍然成立,并说明理由;
(3)实际应用:如图3,在某次军事演习中,舰艇甲在指挥中心(O处)北偏西30°的A处,舰艇乙在指挥中心南偏东
的B处,并且两舰艇到指挥中心的距离相等,接到行动指令后,舰艇甲向正东方向以46海里/时的速度前进,同时舰艇乙沿北偏东
的方向以70海里/时的速度前进,2小时后,指挥中心观测到甲、乙两地分别到达E、F处,且两舰艇之间的夹角为
,请直接写出此时两舰艇之间的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/2b5e9a71-8eee-41f3-9933-1860cb952f15.png?resizew=460)
如图1:在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb32dae6823f572ffa028d684733c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5f3f5177ba1f0d2d06cbece8a9a50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d2c0e6fb8f0504c9592a75067666a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ab83ca64f40930cbb82f2a8db66052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a521235c8579c3885389bdd809ab506a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab2665254da99aac4faf2f9a8ea904d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3994a5ba5d7a8be2e31601358fb143a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac09e961b25848c2860065aa8f577e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382dcc8aa37ed16c588b41888c3906a7.png)
(2)探索延伸:如图2,若在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4840509d9a0f1ae1d30627fe87e1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b41454673e6c10113bb67294485918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
(3)实际应用:如图3,在某次军事演习中,舰艇甲在指挥中心(O处)北偏西30°的A处,舰艇乙在指挥中心南偏东
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdafa4105ef855dfbcff3be2e049d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb90b8c8cadeb19eaf4e2abec1ab413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdafa4105ef855dfbcff3be2e049d96.png)
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解答题-计算题
|
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(0.4)
【推荐1】
中,
,
,点P是射线
上的一个动点,
,且
,直线
交直线
于点M,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/08ef4f7f-b9ae-4593-8f26-cf9863f2ed2e.png?resizew=312)
(1)如图①,当点P是
的中点时,
的度数为 ;
(2)如图②,当点P不是
的中点时,请判断(1)中的结论是否仍然成立,若成立,请写出证明过程;若不成立,请说明理由;
(3)若
,当
时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4f7e460ff33e4853e6cd738d893573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378ab247cf28dd1b17d48a508fa92176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/08ef4f7f-b9ae-4593-8f26-cf9863f2ed2e.png?resizew=312)
(1)如图①,当点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66efb2e5b7aa63e8561be256d691fc88.png)
(2)如图②,当点P不是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f9bba0e729202b7b71c72b5f2ae958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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【推荐2】 如图1,在平面直角坐标系中,直线y=-
x+4分别与x轴、y轴交于点A、点B,将△AOB绕坐标原点逆时针旋转90°得到△COD,直线CD交直线AB于点E.
(1)求直线CD的函数表达式;
(2)如图2,连接OE,过点O作OF⊥OE交直线CD于点F,
①求证:∠OEF=45°;
②求点F的坐标;
(3)若点P是直线DC上一点,点Q是x轴上一点(点Q不与点O重合),当△DPQ与△DOC全等时,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(1)求直线CD的函数表达式;
(2)如图2,连接OE,过点O作OF⊥OE交直线CD于点F,
①求证:∠OEF=45°;
②求点F的坐标;
(3)若点P是直线DC上一点,点Q是x轴上一点(点Q不与点O重合),当△DPQ与△DOC全等时,直接写出点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/1cd3341c-f0a6-42f7-9d95-20f50139d968.png?resizew=336)
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【推荐3】旋转变换是全等变换的一种形式,我们在解题实践中经常用旋转变换的方法来构造全等三角形来解决问题.
(1)方法探究:如图①,在△ABC中,∠BAC=90°,AB=AC,点D、E在边BC上,∠DAE=45°
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/387025d3-f45a-49d8-bc9c-8fbde44b5407.png?resizew=227)
试探究线段BD、CE、DE可以组成什么样的三角形.我们可以过点B作BF⊥BC,使BF=EC,连接AF、DF,易得∠AFB=45°进而得到△AFB≌△AEC,相当于把△AEC绕点A顺时针旋转90°到△AFB,请接着完成下面的推理过程:
∵△AFB≌△AEC,
∴∠BAF= ,AF=AE,
∵∠BAC=90°,∠DAE=45°,
∴∠BAD+∠CAE= ,
∴∠BAF+∠BAD=45°,
∴∠DAF=45°= ,
在△DAF与△DAE中,
AF=AE,
∠DAF=∠DAE,
AD=AD,
∴△DAF≌△DAE,
∴DF= ,
∵BD、BF、DF组成直角三角形,
∴BD、CE、DE组成直角三角形.
(2)方法运用
① 如图②,在四边形ABCD中,AB=AD,∠BAD=∠BCD=90°,∠ABC+∠ADC=180°,点E在边BC上,点F在边CD上,∠EAF=45°试判断线段BE、DF、EF之间的数量关系,并说明理由.
② 如图③,在①的基础上若点E、F分别在BC和CD的延长线,其他条件不变,①中的关系在图③中是否仍然成立?若成立请说明理由;若不成立请写出新的关系,并说明理由.
(1)方法探究:如图①,在△ABC中,∠BAC=90°,AB=AC,点D、E在边BC上,∠DAE=45°
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/387025d3-f45a-49d8-bc9c-8fbde44b5407.png?resizew=227)
试探究线段BD、CE、DE可以组成什么样的三角形.我们可以过点B作BF⊥BC,使BF=EC,连接AF、DF,易得∠AFB=45°进而得到△AFB≌△AEC,相当于把△AEC绕点A顺时针旋转90°到△AFB,请接着完成下面的推理过程:
∵△AFB≌△AEC,
∴∠BAF= ,AF=AE,
∵∠BAC=90°,∠DAE=45°,
∴∠BAD+∠CAE= ,
∴∠BAF+∠BAD=45°,
∴∠DAF=45°= ,
在△DAF与△DAE中,
AF=AE,
∠DAF=∠DAE,
AD=AD,
∴△DAF≌△DAE,
∴DF= ,
∵BD、BF、DF组成直角三角形,
∴BD、CE、DE组成直角三角形.
(2)方法运用
① 如图②,在四边形ABCD中,AB=AD,∠BAD=∠BCD=90°,∠ABC+∠ADC=180°,点E在边BC上,点F在边CD上,∠EAF=45°试判断线段BE、DF、EF之间的数量关系,并说明理由.
② 如图③,在①的基础上若点E、F分别在BC和CD的延长线,其他条件不变,①中的关系在图③中是否仍然成立?若成立请说明理由;若不成立请写出新的关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/17fa7a67-e1e1-4758-84ac-ecb29846e2d6.png?resizew=494)
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【推荐1】在综合与实践课上,老师组织同学们以“矩形纸片的折叠”为主题开展数学探究活动:
如图1,在矩形
中,
(其中
),点
是
边上一动点(点
不与
重合),点
是
边的中点,连结
,将矩形
沿直线
进行翻折,其顶点
翻折后的对应点为
,连结
并延长,交
边于点
(点
不与
重合),过点
作
的平分线
,交矩形
的边于点
.
与
的位置关系,并说明理由;
(2)【特例探究】如图2,在点
运动过程中,若
、
、
三点在同一条直线上时,点
与点
刚好重合,求
的值;
(3)【拓展应用】若
,连结
,
,当
是以
为直角边的直角三角形时,请求出
的值.
如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e968d014047afef23bb59dc9685eef15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b17d35aa904ba88c0ee8334f77289e.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a09d2d1b9b9d4562d74196cef3e3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(2)【特例探究】如图2,在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)【拓展应用】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c54737f21af0d087e4de13e61661ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1af8ccb1e6662215b72aae7625601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e253f26da9c7c4b5e8fcfac3ca0f168d.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知直线
,抛物线:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/be9cbf18-aee2-4430-9339-3cae76b82149.png?resizew=204)
(1)若抛物线经过
,
两点,且抛物线的顶点在直线
上,求此时抛物线的顶点坐标;
(2)若把直线
向上平移
个单位长度得到直线
,且无论非零实数
为何值,直线
与抛物线都只有一个交点.
①求此时抛物线的解析式;
②已知
是过点
且平行于
轴的直线,点
是此抛物线上的一个动点(点
不在
轴上),过点
作直线
轴与直线
交于点
,
为原点,求证
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62fba18598a341e2ecbd09f1555c8f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929925842ca723b34647ccaa596cdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/be9cbf18-aee2-4430-9339-3cae76b82149.png?resizew=204)
(1)若抛物线经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa70fa7eb86c3733e2c1f1c7d07dd802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010c48f89ae74c8244e3a4a841bc773a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
(2)若把直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce09969ace10dd0a8d755f5cdec0bc9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
①求此时抛物线的解析式;
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548776b62e7a92e1b11f5aeaf4d52392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdc02f00cf00a6dfd88b53a90f1f7a4.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐1】在矩形
中,
,
是边
上一点,把
沿直线
折叠,顶点
的对应点是点
,过点
作
,垂足为
且在
上,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695902230487040/2704677685051392/STEM/d7c00c56ed1a41e08d7ff93e42cb9a47.png?resizew=447)
(1)如图1,若点
是
的中点,求证:
;
(2)如图2,当
,且
,求
的值.
(3)如图3,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d89ff9e8f94e5f3956ac0c9509e1888.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695902230487040/2704677685051392/STEM/d7c00c56ed1a41e08d7ff93e42cb9a47.png?resizew=447)
(1)如图1,若点
![](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/c98927fc2453bff0c6d36102001f8d62.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5c3ccd350ed8aad71fed37ea423b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae995fabb31e44bd5eaa5642e7e95c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a70b447d8986b5f7763f7d9a503fc14.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7617d86e6bed133a865f58dea804e1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】我们不妨约定:如图①,若点D在
的边
上,且满足
(或
),则称满足这样条件的点为
边
上的“完美点”.
(1)如图①,若点D是
的边
的中点,
,试判断点D是不是
边
上的“完美点”,并说明理由;
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394542482309120/2394717862879232/STEM/352b059c01c542fd9f21ea07739f57d3.png?resizew=138)
(2)如图②,在
中,
为直径,且
,若点D是
边
上的“完美点”,求
的长;
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394542482309120/2394717862879232/STEM/c750792137c844768e6d972122238438.png?resizew=126)
(3)如图③,平面直角坐标系中,已知点
,
,C为y轴正半轴上一点,且满足
,D点为过A、B、C三点的抛物线上一点,且横坐标为3,试问在x轴上是否存在一点E,使点A,B,E中的某一点是以其余两点及点C构成的三角形中剩余两点所在边上的“完美点”.若存在,请求出点E的坐标及直线
的解析式;若不存在,请说明理由.
![](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/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbbf470efc0ca30e0f5bbc5cb5bad1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)如图①,若点D是
![](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/cf352645d013979be7998a05705df2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394542482309120/2394717862879232/STEM/352b059c01c542fd9f21ea07739f57d3.png?resizew=138)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4548f93753d1a71f126a4fad52df024a.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394542482309120/2394717862879232/STEM/c750792137c844768e6d972122238438.png?resizew=126)
(3)如图③,平面直角坐标系中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394542482309120/2394717862879232/STEM/af67b3f3cbfd4ef988bf51f50d3f3544.png?resizew=105)
您最近一年使用:0次