已知函數(shù)f(x)=2x+2/x+alnx,a∈R
已知函數(shù)f(x)=2x+2/x+alnx,a∈R
(1)若函數(shù)f(x)在[1,+∞)上單調(diào)遞增,求實數(shù)a的取值范圍
(2)記函數(shù)g(x)=x^2[f'(x)+2x-2],若g(x)的最小值是-6,求函數(shù)f(x)的解析式
(1)若函數(shù)f(x)在[1,+∞)上單調(diào)遞增,求實數(shù)a的取值范圍
(2)記函數(shù)g(x)=x^2[f'(x)+2x-2],若g(x)的最小值是-6,求函數(shù)f(x)的解析式
數(shù)學人氣:666 ℃時間:2020-04-06 17:11:06
優(yōu)質(zhì)解答
1、f(x)=2x+2/x+alnx,設y1=2x+2/x,y2=alnx,∴f(x)=y1+y2y1是典型的對號函數(shù),又由f(x)的解析式可知 x>0,y1在(0,1]遞減,[1,+∞)遞增y2是對數(shù)函數(shù),要使函數(shù)f(x)在[1,+∞)上單調(diào)遞增,y2也得是在x∈[1,+∞)遞增又∵ln...
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