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已知函数f（x）=lnx+ax2+（2a+1）x．（Ι）讨论f（x）的单调性；（Ⅱ）当a＜0时，证明f（x）≤--2．
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高二下学期数学《2016级高二年级数学学科竞赛班专题学案材料序号：3》真题及答案
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