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已知a>0,b>0,则的化简结果为( ) A.-9a B.-9 C.9 D.-9...
已知a>0,b>0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328040601808/SYS201311031023280406018005_ST/0.png)
的化简结果为( )
A.-9a
B.-9
C.9
D.-9a
2
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