①化简:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/1.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/2.png)
+(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/3.png)
-2)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/4.png)
.
②先化简,再求值:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/5.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/6.png)
÷x,其中x=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164750059942601/SYS201310221647500599426020_ST/7.png)
.
考点分析:
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