(1)F(x)=f(x)+g(x)=log2 x/4+log4 x/2,是增函数,所以值域为[F(根号下2),F(8)],即
[-7/4,2]
(2)G(x)=f(x) *g(x)=(log2 x-2)(log4 x-1/2)在[根号下2,8]上为增函数,值域为
[G(根号下2),G(8)]=[3/8,1]
(1)F(x)=f(x)+g(x)=log2 x/4+log4 x/2,是增函数,所以值域为[F(根号下2),F(8)],即
[-7/4,2]
(2)G(x)=f(x) *g(x)=(log2 x-2)(log4 x-1/2)在[根号下2,8]上为增函数,值域为
[G(根号下2),G(8)]=[3/8,1]