计算:
(1)
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/0.png)
•2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/1.png)
•(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/2.png)
);
(2)(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/3.png)
a
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/4.png)
+6a
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/5.png)
)-(b
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/6.png)
-a
2![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000314917585967/SYS201311030003149175859014_ST/7.png)
).
考点分析:
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