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函数y=f(x)是R上的偶函数,且在(-∞,0]上是增函数,若f(a)≤f(2)...
函数y=f(x)是R上的偶函数,且在(-∞,0]上是增函数,若f(a)≤f(2),则实数a的取值范围是( )
A.a≤2
B.a≥-2
C.-2≤a≤2
D.a≤-2或a≥2
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