观察下列图形,①中有1个圆,②中有5个圆,③中有13个圆……,若依此规律,则第⑥个图形中圆的个数为( )
![](https://img.xkw.com/dksih/QBM/2020/5/26/2470781222371328/2471584540180480/STEM/97a3e589cf5d4a009ee7e458e0fa49b3.png?resizew=360)
![](https://img.xkw.com/dksih/QBM/2020/5/26/2470781222371328/2471584540180480/STEM/97a3e589cf5d4a009ee7e458e0fa49b3.png?resizew=360)
A.25 | B.61 | C.41 | D.65 |
更新时间:2020-05-27 09:14:31
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【推荐1】等边
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【推荐2】如图,某校礼堂的座位分为四个区域,前区共有
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