将一些形状相同的小五角星如图所示的规律摆放,据此规律,第5个图形有_______ 个五角星,第n个图形有______ 个五角星.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/6191aebf-27cb-4867-8df2-5a93316528b5.png?resizew=490)
更新时间:2023-06-26 13:41:10
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【推荐1】图1是一张足够长的纸条,其中
,点A、B分别在
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上,记
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与
重合,得折痕
,如图3,将纸条展开后再折叠,使
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,将纸条展开后继续折叠,使
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依此类推,第
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____ (用含a和n的代数式表示)
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【推荐2】如上图,每一幅图中均含有若干个小正方形,第1幅图中有1个小正方形;第2幅图中有4个小正方形,第3幅图中有9个小正方形……按这样的规律下去,这样的方法拼成的第n幅图比第
幅图多________ 个小正方形(
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c963caefd1a314ca9641ae98ee57237f.png)
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【推荐1】用完全一样的火柴棍按如图所示的方法拼成“金鱼”形状的图形,则按照这样的方法拼成第
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【推荐2】用小棒按照如下方式摆图形.
摆第7个图形需要( ) 根小棒,摆第n个图形需要( ) 根小棒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/092ecc08-ff67-4f0a-baed-4d61b0233aed.png?resizew=452)
摆第7个图形需要
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