题目内容
探索题:观察下列格式
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/1.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/2.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/3.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/4.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/5.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/6.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/7.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/8.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/9.png)
【答案】分析:先将第一个括号内的各式分母有理化,此时发现除第二项和倒数第二项外,其他各项的和为0,由此可求出第一个括号内代数式的值,进而可根据平方差公式求出整个代数式的值.
解答:解:原式=(
-
+
-
+
-
+…+
-
)(
+
)
=(
-
)(
+
)
=2009-2
=2007.
点评:此题考查的是二次根式的混合运算,能够发现式子中的规律是解答此题的关键.
解答:解:原式=(
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/1.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/2.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/3.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/4.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/5.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/6.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/7.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/8.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/9.png)
=(
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/10.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/11.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/12.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/20131103001308952951014/SYS201311030013089529510023_DA/13.png)
=2009-2
=2007.
点评:此题考查的是二次根式的混合运算,能够发现式子中的规律是解答此题的关键.
![](http://thumb2018.1010pic.com/images/loading.gif)
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