已知f(x)为偶数,且f(2+x)=f(2﹣x),当﹣2≤x≤0时,f(x)=2x,

已知f(x)为偶数,且f(2+x)=f(2﹣x),当﹣2≤x≤0时,f(x)=2x,若nN*,an=f(n),则a2013=  

答案

解答: 解:∵f(2+x)=f(2﹣x),

∴f(4+x)=f(2+(2+x))=f(2﹣(2+x))=f(﹣x)

又∵f(x)为偶数,即f(﹣x)=f(x)

∴f(4+x)=f(x),得函数f(x)的最小正周期为4

∴f(2013)=f(503×4+1)=f(1)

而f(﹣1)=2﹣1=,可得f(1)=f(﹣1)=

因此,a2013=f(2013)=f(1)=

故答案为:

 

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