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#418f93fc-c86b-47a9-85fb-dbf334fc974b中等填空题函数的单调性函数

25. 已知函数f(x)f(x)关于直线x=0x=0对称,且当x1<x20x_{1}<x_{2}\leqslant 0时,[f(x2)f(x1)](x2x1)>0[f(x_{2})-f(x_{1})](x_{2}-x_{1})>0恒成立,则满足f(3x1)>f(13)f({3x-1})>f({\frac{1}{3}})xx的取值范围是((  ))