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函数f(x)=ax3+bx2-2x(a、b∈R且ab≠0)的图象如如图所示,且x...
函数f(x)=ax
3+bx
2-2x(a、b∈R且ab≠0)的图象如如图所示,且x
1+x
2<0,则有( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857136840855/SYS201311012218571368408002_ST/images0.png)
A.a>0,b>0
B.a<0,b<0
C.a<0,b>0
D.a>0,b<0
考点分析:
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