平面上有n条直线,它们任何两条不平行,任何三条不共点,设
条这样的直线把平面分成
个区域,则
条直线把平面分成的区域数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8a5282de80b7a8e2cd29049d8177e.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e6cb8d4e39fa44f71df04b74f123f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b00f4eb7f1bd2ccefbabf0c1dfa8f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8a5282de80b7a8e2cd29049d8177e.png)
更新时间:2018-02-25 22:30:54
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【推荐1】观察下面几个算式:
;
;
;1+2+3+4+5+4+3+2+1=25.利用上面算式的规律,计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0700233c2fe8ea05917595ae30dceadb.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4f19a71132d1b0c1b94e8ed4a71d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5544505c536f6dd1c7d1edf5b4ac49c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f94c2db85d4b183391a443c983be9b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0700233c2fe8ea05917595ae30dceadb.png)
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填空题-单空题
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较易
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解题方法
【推荐2】将全体正整数排成一个三角形数阵:
1
4 5 6
7 8 9 10
………………………
按照以上排列的规律,第
行
从左向右的第3个数为______
1
2 3
4 5 6
7 8 9 10
………………………
按照以上排列的规律,第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80be0c3c50d2bd6230b53fbd056122df.png)
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