题目内容
观察下列有序数对:(3,-1)(-5,![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_ST/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_ST/1.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_ST/2.png)
【答案】分析:寻找规律,然后解答.第n个有序数对可以表示为[(-1)n+1•(2n+1),(-1)n•
].
解答:解:观察后发现第n个有序数对可以表示为[(-1)n+1•(2n+1),(-1)n•
],
∴第100个有序数对是(-201,
).故答案填(-201,
).
点评:本题考查了学生的阅读理解及总结规律的能力,找到规律是解题的关键.
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_DA/0.png)
解答:解:观察后发现第n个有序数对可以表示为[(-1)n+1•(2n+1),(-1)n•
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_DA/1.png)
∴第100个有序数对是(-201,
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_DA/2.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103194341569973496/SYS201311031943415699734004_DA/3.png)
点评:本题考查了学生的阅读理解及总结规律的能力,找到规律是解题的关键.
![](http://thumb2018.1010pic.com/images/loading.gif)
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