=-12/22 22xlna=zlna lnb=zlnab_百度知道
=-12/22 22xlna=zlna lnb=zlnab
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2 b&=-2=-2/11 11
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出门在外也不愁若a,b>0,求证lna-lnb>=1- b/a如题
1.当a>=b时,设x=a/b >=1,只要证 f(x)=lnx + 1/x -1>=0在 x>=1恒成立对f(x)求导,可知导数在于等于0,即在定义x>=1上是增函数,最小值在x=1处取得,f(1)=0,得证2.同理,当a=1,证f(x)=-lnx + x-1 >=0恒成立即可,也是先求导得出是增函数,最小值f(1)=0,得证综上,若a,b>0,则lna-lnb>=1- b/a
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扫描下载二维码lnA×lnB=lnAB嘛?如果不等于那等于什么?
還是你好oC
lnA×lnB不=lnABlnA×lnB=lnA×lnB
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