${\left( {\dfrac{5}{4}} \right)^m} > {\left( {\dfrac{6}{5}} \right)^m} > 1$ 

${\left( {\dfrac{5}{4}} \right)^m} < {\left( {\dfrac{6}{5}} \right)^m} < 1$           

${\left( {\dfrac{5}{4}} \right)^m} < 1 < {\left( {\dfrac{6}{5}} \right)^m}$ 

$1 < {\left( {\dfrac{5}{4}} \right)^m} < {\left( {\dfrac{6}{5}} \right)^m}$