如图,四边形ABCD中,
,
,且
,以AB,BC,CD为边向外作正方形,其面积分别为
,
,
,若
,
,则
的值为( ).
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987953794506752/3069946738835456/STEM/54a4bea9866b46f99997f474aaa75af6.png?resizew=315)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987953794506752/3069946738835456/STEM/54a4bea9866b46f99997f474aaa75af6.png?resizew=315)
A.8 | B.12 | C.24 | D.48 |
更新时间:2022-09-19 18:45:32
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【推荐1】勾股定理是人类最伟大的科学发现之一,在我国古算书《周髀算经》中早有记载,如图以直角三角形的各边为边分别向同侧作正方形,若知道图中阴影部分的面积之和,则一定能求出( )
A.正方形![]() | B.正方形![]() |
C.正方形![]() | D.![]() |
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【推荐2】如图,在四边形
中,
,分别以四边形
的四条边为边向外作四个正方形,面积分别为a,b,c,d,且
.若
,
.则下列判断错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1a32e0f0a5b60e5ac705b77407db01.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaa32aba49e93f4efd88edc6fe7e0aa.png)
A.![]() | B.![]() |
C.四边形![]() | D.![]() |
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【推荐1】如图,将四边形纸片
沿过点A的直线折叠,使得点B落在
上的点M处.折痕为
;再将
分别沿
,
折叠,此时点C,D落在
上的同一点N处.下面结论中正确的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/34139d8f-9edf-4bce-b1f0-13efd5bb8b06.png?resizew=162)
①M是
的中点;②
;③
;④当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3194bb32dbbff0f5bf4cd9284a95d23f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/34139d8f-9edf-4bce-b1f0-13efd5bb8b06.png?resizew=162)
①M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3194bb32dbbff0f5bf4cd9284a95d23f.png)
A.1 | B.2 | C.3 | D.4 |
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名校
【推荐2】如图,在
中,对角线
,
为
的中点,经过点
的直线交
于
,交
于
,连接
、
,现在添加一个适当的条件,使四边形
是菱形,下列条件:①
;②
;③
平分
;④
为
中点.正确的有( )个.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/b276ddb9-9181-43f1-8627-b2cbda721bc8.png?resizew=180)
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