已知:如图,在
、
中,
,
,
,
,点C、D、E三点在同一直线上,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/00ad7908-a4b0-430b-91bd-878824925e69.png?resizew=147)
(1)求证:
;
(2)请判断
有何大小、位置关系,并证明.
![](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/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9359f7d8e8ccb1185f456fc6606bfc29.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/30/00ad7908-a4b0-430b-91bd-878824925e69.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc71a2c3f2159da7847f4c6350ad4a53.png)
(2)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee06d1b67343eac57e4bc24580799c6.png)
更新时间:2023-10-28 12:39:42
|
相似题推荐
解答题-证明题
|
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名校
【推荐1】已知:如图,点
、
、
、
在同一条直线上,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/1bff52cb-ed3c-4916-b8a8-ad37d931fd36.png?resizew=153)
(1)求证:
.
(2)若
,求
的长.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ff31dc799577afdb5441df6eaf3694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c034fdb6e86d8390970ca0c286c2004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53f982a67cfcd2b66afc59c74a2a73e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/1bff52cb-ed3c-4916-b8a8-ad37d931fd36.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc89b5ef8dc5f8dde747a688215c611a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b418586278f75e20ee56a86e24cb2601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
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解答题-作图题
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【推荐2】下面是小明同学设计的“已知底边及底边上的中线作等腰三角形”的尺规作图过程.
已知:如图1,线段a和线段b.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893759530532864/2894341097848832/STEM/d9eb5890-104c-4e98-9a56-6345975a7608.png?resizew=116)
求作:
,使得
,
,BC边上的中线为b.
作法:如图2,
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893759530532864/2894341097848832/STEM/b82ebd79-ec4b-4615-b8c5-e382feae3cbb.png?resizew=147)
①作射线BM,并在射线BM上截取
;
②作线段BC的垂直平分线PQ,PQ交BC于点D;
③以点D为圆心,b为半径作弧,交PQ于点A;
④连接AB和AC.
则
为所求作的等腰三角形.
(1)用直尺和圆规,依作法补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:由作图可知
,
.
∵PQ为线段BC的垂直平分线,点A在PQ上,
∴
(______)(填推理的依据).
又∵线段BC的垂直平分线PQ交BC于点D,
∴
.
∴AD为BC边上的中线.
已知:如图1,线段a和线段b.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893759530532864/2894341097848832/STEM/d9eb5890-104c-4e98-9a56-6345975a7608.png?resizew=116)
求作:
![](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/8e781a2489271bfd1597cba1bb6f5887.png)
作法:如图2,
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893759530532864/2894341097848832/STEM/b82ebd79-ec4b-4615-b8c5-e382feae3cbb.png?resizew=147)
①作射线BM,并在射线BM上截取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
②作线段BC的垂直平分线PQ,PQ交BC于点D;
③以点D为圆心,b为半径作弧,交PQ于点A;
④连接AB和AC.
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)用直尺和圆规,依作法补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:由作图可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b857c7ca55dfa6da108df1d3cee2.png)
∵PQ为线段BC的垂直平分线,点A在PQ上,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
又∵线段BC的垂直平分线PQ交BC于点D,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
∴AD为BC边上的中线.
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解答题-证明题
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【推荐1】如图,在
中,对角线
与
相交于点O,点E,F在对角线
上,且
,连接
.
.
(2)当
,四边形
是什么特殊四边形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f91470c80885ebb4916e4593df930d6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dae0ff37aafacd1e578c0d060bdd83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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解答题-问答题
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【推荐2】如图,线段AD、BC相交于点O,且OA=OD,OB=OC,试判断AB与CD的位置关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/8/2415208809906176/2415668870447104/STEM/eea98e1c47bf4c2d9c84eea465b5c0b2.png?resizew=175)
您最近一年使用:0次