如图是由一些火柴棒搭成的图案:
(1)摆第3个图案用______ 根火柴棒.
(2)按照这种方式摆下去,摆第
个图案用______ 根火柴棒(
为正整数).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/1d627cb0-0de4-4c4f-a4f6-809743919e2f.png?resizew=326)
(1)摆第3个图案用
(2)按照这种方式摆下去,摆第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
更新时间:2023-12-29 22:06:53
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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4个图形需要火柴棍________ 根,拼成第n个图形(n为整数)需要火柴棍________ 根(用含n的代数式表示).
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【推荐2】下列图形都是由同样大小的正方形和正三角形按一定的规律组成,其中,第①个图形中一共有5个正多边形,第②个图形中一共有13个正多边形,第③个图形中一共有26个正多边形,则第⑥个图形中正多边形的个数为________
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【推荐1】如图,
中,
,
,点
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,
…
将
分成
等份,过点
,
,
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分别作
的垂线,
交
于点
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,
…
,用
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分别表示:
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的面积,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0cf2a525c0604cdaafb441a4ce9ec7d.png)
______ .
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