6.若函數(shù)y=f(x)同時滿足:①f(x)>0;②函數(shù)y=f(x)與函數(shù)y=log
af(x)(a>1)的單調(diào)性一致,則稱函數(shù)y=f(x)為“魯西西函數(shù)”.例如:函數(shù)f(x)=
在(-∞,0)上單調(diào)遞減,在(0,+∞)上單調(diào)遞增.g(x)=x
2同樣在(-∞,0)上單調(diào)遞減,在(0,+∞)上單調(diào)遞增.若函數(shù)h(x)=
(x>0)為“魯西西函數(shù)”,則h(x)在(0,+∞)上的最大值為( ?。?/div>