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已知函数f(x)=-x3+ax2+b(a,b∈R).对任意x∈[0,1],y=f...
已知函数f(x)=-x
3+ax
2+b(a,b∈R).对任意x
∈[0,1],y=f(x)的图象x=x
处的切线的斜率为k,当|k|≤1时,a的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101200926908587/SYS201311031012009269085007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101200926908587/SYS201311031012009269085007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101200926908587/SYS201311031012009269085007_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101200926908587/SYS201311031012009269085007_ST/3.png)
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