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#984f07f9-2035-4c6d-91bf-a13bf06413a3简单填空题导数与单调性导数

16. (2023春•武安市校级月考)若函数f(x)=12ax2lnxf(x)=\frac{1}{2}a{x^2}-lnx在区间(13,2)({\frac{1}{3},2})内存在单调递减区间,则实数aa的取值范围是((  ))