如图由12根完全相同的小棒拼接而成(图中所有的锐角与钝角互补),请你再添4根与前面完全相同的小棒,使拼接后的图形恰好有5个菱形,不同的添法共有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/e721bd4e-66ab-4930-88e6-7eb0cc92028a.png?resizew=140)
A.5种 | B.6种 | C.7种 | D.8种 |
更新时间:2023-05-17 11:03:22
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【推荐1】如图,已知在纸上有一点
.按下列尺规作图的步骤进行:
①以点
为圆心,以任意长
为半径,画半圆
,直径为
;
②分别以点
,
为圆心,大于
长为半径作弧,两弧交于点
,
,作直线
,交半圆
于点
;
③连接
,以点
为圆心,以
长为半径作弧,交半圆
于点
,连接
,
.
下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909a84c5f1e6ceea48418209d17c3a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
下列结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/79731a21-ac16-4351-9117-da48cc8b157b.png?resizew=202)
A.四边形![]() | B.四边形![]() ![]() | C.![]() | D.![]() ![]() |
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【推荐2】在平面直角坐标系
中,将位于第三象限的点
和位于第二象限的点
先向下平移1个单位,再向右平移h个单位得到点C和点D,连接
,过点B作
的垂线l,在l上任取一点E,连接
,则
的最小值为2.下列几个结论:①直线l与y轴平行;②
;③四边形
是菱形;④若点
是直线
上的点,则
.其中正确结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355286b7b85a87620a369a386c962f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e753dc81ed21f878fff89e98cccf24a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50aa13496f1f9f025a149a636994e01e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb195cc80e0f77e899b9d5744fbd264.png)
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