（3a^2b)^-2(a^-3b^-2)^-1
=(1/9)a^(-4) *b^(-2) *a^3 *b^2
=(1/9)a^(-1)
=1/(9a)
.
(4x^2y^-3)除以(12x^2y^3)
=8y^(-6)
（3a^2b)^-2(a^-3b^-2)^-1 (4x^2y^-3)除以(1\2x^2y^3)
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