如图,在▱ABCD中,∠ADC的平分线经过BC的中点E,与AB的延长线交于点F.求证:AE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/ccaf622a-94c6-4f5e-a3d6-4d653f9d84b5.png?resizew=152)
2021·四川南充·一模 查看更多[5]
更新时间:2022-03-11 21:12:16
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,在
中,
,点D是
的中点,点E在
上.
;
(2)如图2,若
,
的延长线交
于点F,且
,垂足为F,原题设其它条件不变,求证:
;
(3)在(2)的条件下,请直接写出
、
、
的数量关系:____________________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e576dc39d5f70bbfd675551699599.png)
(3)在(2)的条件下,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dd37bdc8ebd0561555e698ee7f1bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d5b362f33e2b5679be3dbc4f777ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535e8435fa166d65e815144b9d4dd3ee.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】问题发现】
(1)若四边形
是菱形,
,点P是射线
上一动点.
为边向右侧作等边
,如图1,当点E在菱形
内部或边上时,连接
,则
与
有怎样的数量关系?并说明理由;
【类比探究】
(2)若四边形
是正方形,点P是射线
上一动点,以
为直角边在
边的右侧作等腰
,其中
,
,如图2.当点P在对角线
上:
①求证:点E在
边所在直线上;
②探究
与
之间的数量关系,并说明理由;
【拓展延伸】
(3)在(2)的条件下,如图3,在正方形
中,
,当P是对角线
的延长线上一动点时,连接
,若
,求
的面积及
的长.
(1)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58c489382cf832f739a0e53b40dcccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/b9798e84-6ad1-40c9-9441-63f75b649738.png?resizew=148)
【类比探究】
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7535c294d0e6332b37fccd916c1aa3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3599885b5d5ab4c2e2ce9614701b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a776eac67bbc30e382f5f7916a40cd12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/f69e0db3-02ba-4e7f-ae7e-6673653b2307.png?resizew=138)
①求证:点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【拓展延伸】
(3)在(2)的条件下,如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b7bd8a2436e2f2bb89fefa70139273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3cd61d00f89e68ccca2cac5c937783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/1300573e-5879-4d38-ba9e-d80f897f3629.png?resizew=230)
您最近一年使用:0次
【推荐3】在平面直角坐标系中,直线 AB 分别交 x 轴、y 轴于点A(–a,0)、点 B(0, b),且 a、b 满足a2+b2–4a–8b+20=0,点 P 在直线 AB 的右侧,且∠APB=45°.
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462675650117632/2463824486989824/STEM/4faa94ce752d4c2bbf5ecc5766e3e7fb.png?resizew=183)
(1)a= ;b= .
(2)若点 P 在 x 轴上,请在图中画出图形(BP 为虚线),并写出点 P 的坐标;
(3)若点 P 不在 x 轴上,是否存在点P,使△ABP 为直角三角形?若存在,请求出此时P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/5/14/2462675650117632/2463824486989824/STEM/4faa94ce752d4c2bbf5ecc5766e3e7fb.png?resizew=183)
(1)a= ;b= .
(2)若点 P 在 x 轴上,请在图中画出图形(BP 为虚线),并写出点 P 的坐标;
(3)若点 P 不在 x 轴上,是否存在点P,使△ABP 为直角三角形?若存在,请求出此时P的坐标;若不存在,请说明理由.
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解答题-证明题
|
较难
(0.4)
【推荐1】(1)提出问题:如图1,在
和
中,
,
,
,连
,连
并延长,交
于点
,①
的度数是________;②
________;
(2)类比探究:如图2,在
和
中,
,
,
,连
,连
并延长,交
延长线于点
,①
的度数是________;②
________.
(3)迁移应用:如图3,在等边
中
于点
,点
在线段
上(不与
重合),以
为边在
的左侧构造等边
,在平面内将
绕着点
顺时针旋转一定角度得到图4,
为
的中点,
为
的中点.①求证:在图4情况下
的形状是等腰三角形;②求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc284265d60635e5c43d625f135f8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c3dd84f9ac59a459afce774871e11a.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8886744b28ca0b8a572ab78dd92ac109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ee224ad0d3ac27adcc7c4d7684fe78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1a414db8289f115b76f5ed176e2235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05a8cf87913df114f149d5e2faa32c4.png)
(3)迁移应用:如图3,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d303c32af8831735d4e0f86fa45874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18104b46692bd03c473fa81c38e49ca4.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在
中,
,将
绕点
顺时针旋转
度
得到
,连接
,线段
(或其延长线)分别交
、
于
、
点.
![](https://img.xkw.com/dksih/QBM/2023/1/12/3151091459588096/3151386577707008/STEM/8138ca7f5aec4babb2b12c796f9a7365.png?resizew=365)
(1)求证:
;
(2)在旋转的过程中,是否存在一个时刻,使得
与
全等?若存在,求出此时旋转角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4721089d05b03f280ab38072675f551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b2b5d548905471ee8fa7ab280e4f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c9a77f3dcaacefe3ee0a64ddf7f73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/1/12/3151091459588096/3151386577707008/STEM/8138ca7f5aec4babb2b12c796f9a7365.png?resizew=365)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5743ccb6529cefe7c6760def68f3d357.png)
(2)在旋转的过程中,是否存在一个时刻,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66db4a2bbf1caae6ab1ff564d3653162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b510bc04c7a2e782d1efce364079a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】在平行四边形
中,
的平分线交边
于点
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/582e9600-4dd8-41ac-b078-e180c7248372.png?resizew=388)
(1)如图1,求证:
;
(2)如图2,
,
,连接
、
,当
时,求证:
;
(3)在(2)的条件下,当
,
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/582e9600-4dd8-41ac-b078-e180c7248372.png?resizew=388)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4042e4acd0e823c2a69ce8bee3b995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6199dcbb3a540d98b8432ba58a5a2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64bc876e82280a54d49bb142dae9a464.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55c3f663b6b205bb0d541a72e4d4759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941eba4dbc1094107e1eeb02c8d8cd56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,点P是□ABCD对角线AC所在直线上的一个动点(点P不与点A、C重合),分别过点A、C向直线BP作垂线,垂足分别为点E、F,点O为AC的中点.
(1)当点P与点O重合时如图1,线段OE与线段OF的数量关系是______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/879252d4-7101-4a2c-b1cb-bfdb8de4bb65.png?resizew=641)
(2)如图2,点P在OC上运动时(不与点O与C重合),(1)中的结论是否成立?
(3)点P在OC的延长线上运动时,当∠OFE=60°时,如图3的位置,猜想线段CF、AE、OE之间有怎样的数量关系?
(1)当点P与点O重合时如图1,线段OE与线段OF的数量关系是______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/879252d4-7101-4a2c-b1cb-bfdb8de4bb65.png?resizew=641)
(2)如图2,点P在OC上运动时(不与点O与C重合),(1)中的结论是否成立?
(3)点P在OC的延长线上运动时,当∠OFE=60°时,如图3的位置,猜想线段CF、AE、OE之间有怎样的数量关系?
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解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】如图,在
中,
是高,
是角平分线,
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/11/2439240921784320/2439811610132480/STEM/731e5838bb1e4d799cf18b4bf7b8f133.png?resizew=206)
(
)求
、
和
的度数.
(
)若图形发生了变化,已知的两个角度数改为:当
,
,则
__________
.
当
,
时,则
__________
.
当
,
时,则
__________
.
当
,
时,则
__________
.
(
)若
和
的度数改为用字母
和
来表示,你能找到
与
和
之间的关系吗?请直接写出你发现的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030708f7e622f3f992649b21eec6b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/11/2439240921784320/2439811610132480/STEM/731e5838bb1e4d799cf18b4bf7b8f133.png?resizew=206)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e83319502ab3a11e3d0a2da5090d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0374c406b563f0d258aa5c2654bbd06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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【推荐2】如图1,在等边三角形
中,
于
于
与
相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/617a99a0-9cd4-4eea-b28e-0126606a109a.png?resizew=428)
(1)求证:
;
(2)如图2,若点G是线段
上一点,
平分
,
,
交
所在直线于点F.求证:
.
(3)如图3,若点G是线段
上一点(不与点O重合),连接
,在
下方作
,边
交
所在直线于点F.猜想:
三条线段之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044937d7debb70e4f8eeba104acd08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068e1c1a16e257f6736f3af34ef317c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/617a99a0-9cd4-4eea-b28e-0126606a109a.png?resizew=428)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb42c0ba7ec7078702028e220d5451d3.png)
(2)如图2,若点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e93465eafe38b8ef89f90c9d3955dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883a2090ac575f032e379b7e64a623cc.png)
(3)如图3,若点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e93465eafe38b8ef89f90c9d3955dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d830db9e9acff25fe00897fd0531ab9a.png)
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