We know that (X)(X^2) = X^1+2 = X^3
it follows that
(2m^2)(3m^2n^-2) = 6m^4n^-2
But I'm not sure what to do with the -3 exponent on the outside of the last parenthesee in your problem. Been too long since I did any work with exponents.
Maybe this will get you to the point where you can solve the rest. Hope so, anyway.
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