如图,矩形
中,
垂直平分
于点
,
,连接
,
,
,
.若
,
.则下列结论:①四边形
是菱形;②四边形
是正方形;③
;④
.其中一定成立的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6baf820ff60f2015ae352f2b1bc3aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c62cca87325b32db22204f7cfa6cbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/b56b1d9b-a4aa-4447-9b09-e42f160e0b66.png?resizew=185)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2023-11-12 15:23:31
|
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【推荐1】如图,
中,
,
,
平分
交
于D,
于E且
,则
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在正方形
中,
,点
,
分别在
、
上,
,
,
相交于点
,若图中阴影部分的面积与正方形
的面积之比为
,则
的周长为( )
![](https://img.xkw.com/dksih/QBM/2019/8/9/2265065537298432/2265174807658497/STEM/128ee434535845d2af3643cae9fa84a5.png?resizew=115)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】西周数学家商高总结了用“矩”(如图1)测量物高的方法:把矩的两边放置成如图2的位置,从矩的一端
(人眼)望点
,使视线通过点
,记人站立的位置为点
,量出
长,即可算得物高
.令BG=x(m), EG=y(m),若a=30cm,b=60cm,AB=1.6m,则
关于
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】如图,已知DE是直角梯形ABCD的高,将△ADE沿DE翻折,腰AD恰好经过腰BC的中点,则AE:BE等于( )
![](https://img.xkw.com/dksih/QBM/2015/3/2/1573803199578112/1573803205681152/STEM/d6993673c250437695d7f64ea853c1bb.png?resizew=223)
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【推荐1】如图,ABCD,DEFG都是正方形,边长分别为m,n(m<n).坐标原点O为AD的中点,A,D,E在y轴上,若二次函数y=ax2的图象过C,F两点,则
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【推荐2】如图,四边形
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