问题
选择题
设M=
|
答案
M=
> 3x+3y 2
=3x3y
=33x+y
=N,(x≠y)即M>Nx+y 2
又
>x+y 2
(x≠y),∴3xy
>3x+y 2
,即N>Pxy
∴M>N>P
设M=
|
M=
> 3x+3y 2
=3x3y
=33x+y
=N,(x≠y)即M>Nx+y 2
又
>x+y 2
(x≠y),∴3xy
>3x+y 2
,即N>Pxy
∴M>N>P