a^(1/5)*b^(1/6)*a^(-1,2)*b^(-1/3)=
=a^(1/5)*a^(-6/5)*b^(1/6)*b(-1/3)=
=a^(1/5 -6/5)*b^(1/6 -1/3)=
=a^(-1)*b^(-2/3)
