观察下列图形规律,其中第1个图形由6个○组成,第2个图形由14个○组成,第3个图形由24个○组成,…,照此规律下去,则第8个图形○的个数一共是( )
![](https://img.xkw.com/dksih/QBM/2018/5/13/1944658200829952/1946094032248832/STEM/6ce03bec-bc8f-4405-b6b2-44f9097972d3.png?resizew=468)
![](https://img.xkw.com/dksih/QBM/2018/5/13/1944658200829952/1946094032248832/STEM/6ce03bec-bc8f-4405-b6b2-44f9097972d3.png?resizew=468)
A.84 | B.87 | C.107 | D.123 |
更新时间:2018-05-15 22:41:21
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【推荐1】下列图形都是由两样大小的小圆圈按一定规律组成的,其中第①个图形中一共有7个小圆圈,第②个图形中一共有13个小圆圈,第③个图形中一共有21个小圆圈,…,按此规律排列,则第⑧个图
形中小圆圈的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/3c06e129-8c82-4a33-a461-de402b7d0007.png?resizew=348)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074730071162880/2075615336841216/STEM/cd791067a3b54aaba04b3cb5146c5d56.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/3c06e129-8c82-4a33-a461-de402b7d0007.png?resizew=348)
A.68 | B.88 | C.91 | D.93 |
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【推荐2】如图,
,点
在
上.以点
为圆心,
为半径画弧,交
于点
(点
与点
不重合),连接
;再以点
为圆心,
为半径画弧,交
于点
(点
与点
不重合),连接
;再以点
为圆心,
为半径画弧,交
于点
(点
与点
不重合),连接
;…按照这样的方法一直画下去,得到点
,若之后就不能再画出符合要求的点
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469690554335232/2470580457406464/STEM/82fca324-b7c4-4967-8148-a9d665bf96c7.png)
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