如图,第1个图形中有1个三角形,第2个图形中有5个三角形,第3个图形中有9个三角形,…第10个图形中有( )个三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/fa0b8b21-5667-4395-bd26-46a4341904f0.png?resizew=485)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/fa0b8b21-5667-4395-bd26-46a4341904f0.png?resizew=485)
A.37 | B.38 | C.39 | D.40 |
更新时间:2024-01-14 10:17:30
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【推荐1】观察如图所示的图案,每条边上有
(
)个方点,
代表图案中方点的个数,按照你发现的每个图案中的规律,写出第
个图形中方点的个数为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知两个完全相同的大长方形,长为
,宽为
,各放入四个完全一样的白色小长方形后,得到图(1)、图(2),那么
与
之间的关系是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/6f4c2370-ff80-4f3e-b491-5d3769cd4e26.png?resizew=251)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】观察图中正方形四个顶点所标的数字规律,可知数2021应标在( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/8d0a9fbf-8afb-4866-9633-5f56441d7693.png?resizew=435)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/8d0a9fbf-8afb-4866-9633-5f56441d7693.png?resizew=435)
A.第505个正方形的左下角 | B.第505个正方形的右下角 |
C.第506个正方形的左上角 | D.第506个正方形的右上角 |
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【推荐2】如图,四边形
是正方形,曲线
叫作“正方形的渐开线”,其中
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时,弧
的长为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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