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设a,b,c∈(-∞,0),则a+,b+,c+( ) A.都不大于-2 B.都不...
设a,b,c∈(-∞,0),则a+
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,b+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231654436383953/SYS201311012316544363839009_ST/1.png)
,c+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231654436383953/SYS201311012316544363839009_ST/2.png)
( )
A.都不大于-2
B.都不小于-2
C.至少有一个不大于-2
D.至少有一个不小于-2
考点分析:
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