题目内容
平面直角坐标系中,已知点P(1,0),P1(2,1),且![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_ST/0.png)
【答案】分析:由题设条件知
=
(1,1).再由 ![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/2.png)
(1,1)=(1,1)能得到M点的坐标.
解答:解:∵
(n∈N*),
=
=
=
(1,1).
∴P2(2-
,1-
),P3(2-
+
,1-
+
),…,Pn(2-
+
+…+
,1-
+
+…+
)
∴Pn(2+
,1+
,),
∵点Pn无限趋近于点M,
∴点M的坐标为(
)
故答案为(
).
点评:本题考查数列的极限和应用,解题时要注意向量的坐标运算.同时考查了运算能力和分析归纳推理能力,属中档题题..
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/0.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/1.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/2.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/3.png)
解答:解:∵
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/4.png)
=
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/5.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/6.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/7.png)
∴P2(2-
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/8.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/9.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/10.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/11.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/12.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/13.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/14.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/15.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/16.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/17.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/18.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/19.png)
∴Pn(2+
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/20.png)
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/21.png)
∵点Pn无限趋近于点M,
∴点M的坐标为(
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/22.png)
故答案为(
![](http://thumb.zyjl.cn/pic6/res/gzsx/web/STSource/20131024181151188336864/SYS201310241811511883368011_DA/23.png)
点评:本题考查数列的极限和应用,解题时要注意向量的坐标运算.同时考查了运算能力和分析归纳推理能力,属中档题题..
![](http://thumb.zyjl.cn/images/loading.gif)
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