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已知函数f(x)=lnx+ax.1.若a=-1,求函数极值 2.若函数f(x)在区间[2.3]上是单调函数,求a的取值范

已知函数f(x)=lnx+ax.1.若a=-1,求函数极值 2.若函数f(x)在区间[2.3]上是单调函数,求a的取值范围
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x>0
f(x)=lnx-x
f'(x)=1/x-1=0
x=1
0

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