按如图所示的规律搭正方形:搭一个小正方形需要4根小棒,搭两个小正方形需要7根小棒,搭100个这样的小正方形需要小棒( )根.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/846366a7-3124-43d7-90f2-c081898580ea.png?resizew=457)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/846366a7-3124-43d7-90f2-c081898580ea.png?resizew=457)
A.300 | B.301 | C.302 | D.400 |
更新时间:2019-11-02 11:17:01
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【推荐1】如图所示,
![](https://img.xkw.com/dksih/QBM/2017/8/15/1752442718347264/1752782374182912/STEM/2c7b057cf9c04d1d9a969f1810084bd0.png?resizew=450)
将若干个点摆成三角形图案,每条边(包括两个端点)有n(n是正整数且n>1)个点,相应的图案中总的点数记为an ,则
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将若干个点摆成三角形图案,每条边(包括两个端点)有n(n是正整数且n>1)个点,相应的图案中总的点数记为an ,则
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】观察下列一组图形中点的个数的规律,第10个图中点的个数是( )
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