偶函数f(x)在区间[0,+∞﹚上单调增加
则f(x)在区间(-∞,0]上单调递减
且f(1/3)=f(-1/3)
满足f(2x-1)< f(1/3)则
|2x-1|< 1/3
所以x的取值范围是
1/3