古希腊著名的毕达哥拉斯学派把1,3,6,10,…这样的数称为“三角形数”(如图①),而把1,4,9,16,…这样的数称为“正方形数”(如图②).如果规定
,
,
,
,…;
,
,
,
,…;
,
,
,
,…,那么,按此规定,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8c45e4c4ab30665338dd87a2258f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2b5232a2319db7fa5d18baf85e3dd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab7d59ce066c8f0b346719003f8e28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6abbd310bfce5fc6df04add486e95070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f45c9018fcc57c13fcc8165cf8f1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf335cf2f905b456c05cd2577181d809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef84cab5d82af102bb1bf048c3863e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96def5e4cc1fdcb40f4e314663fb13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc5160527a607420dc3c3e3f0ac7827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbc1f82833aecfc48c03b88fdeae297.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/1323f9a2-1038-4395-a913-92c235e39a01.png?resizew=394)
A.180 | B.105 | C.165 | D.136 |
更新时间:2024-02-28 08:29:56
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【推荐1】如图,取一条长度为1的线段,将它三等分,去掉中间一段,余下两条线段,达到第1阶段;将剩下的两条线段再分别三等分,各去掉中间一段,余下四条线段,达到第2阶段;再将剩下四条线段分别三等分,各去掉中间一段,余下八条线段,达到第3阶段;……;这样一直继续操作下去,当达到第2018个阶段时,余下的线段的长度之和为( )
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374551450763264/2375418369261568/STEM/5830adf704544b28a8205fbafeb7d7a0.png?resizew=310)
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A.(![]() | B.(![]() | C.(![]() | D.(![]() |
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【推荐2】如图,正方形的边长均是a,以图①、②、③呈现的规律类推,图⑩中所有圆的周长的和是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/5f852e31-29c5-4c3c-96d6-641473a055e9.png?resizew=429)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/5f852e31-29c5-4c3c-96d6-641473a055e9.png?resizew=429)
A.![]() | B.![]() | C.![]() | D.![]() |
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