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设函数,若数列{an}是单调递减数列,则实数a的取值范围为( ) A.(-∞,2...
设函数
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,若数列{a
n}是单调递减数列,则实数a的取值范围为( )
A.(-∞,2)
B.(-∞,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/1.png)
C.(-∞,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/2.png)
)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211835303/SYS201311031014222118353008_ST/3.png)
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