Food and Drink Club is ____ (he) favourite club.
若函数y=f(x),x∈D同时满足下列条件:
①函数y=f(x)在D内为单调函数;
②存在实数m,n∈D,m<n,当x∈m,n时,函数y=f(x)的值域为m,n,则称此函数f(x)在D内为等射函数,设函数f(x)= ax+a−3lna (a>0,a≠1),
则: