a^-2b^-3·(-3a^-1b^2)÷6a^-4b^-2
=1*(-3)÷6*a^[-2-1-(-4)]b^[-3+2-(-2)]
=-1/2*ab^3
=-ab^3/2
(3ab)^-3(2ab^-1)^-2
=3^(-3)*a^-3b^-3*2^(-2)*a^-2b^2
=1/27*1/4*a^(-3-2)b^(-3+2)
=1/108*a^-5b^-1
=a^-5b^-1/108
a^-2b^-3·(-3a^-1b^2)÷6a^-4b^-2
=1*(-3)÷6*a^[-2-1-(-4)]b^[-3+2-(-2)]
=-1/2*ab^3
=-ab^3/2
(3ab)^-3(2ab^-1)^-2
=3^(-3)*a^-3b^-3*2^(-2)*a^-2b^2
=1/27*1/4*a^(-3-2)b^(-3+2)
=1/108*a^-5b^-1
=a^-5b^-1/108