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(-1 1/5a^2y^-3)^-2= (1 /(-1 1/5a^2y^-3)^2=1/(-(1 1/5)^2*a^4*a^-6
e)
[(-3x^2*y^-3)/5z^4]^-1=5z^4/(-3x^2y^-3)
f)
[(-2x^3y)^-3 / a^-3 ]^-4=[a^-3/(-2x^3y)^-3]^-4=
=[a^-12 / (-2x^3y)^-12=[a/(-2x^3y) ]-12=
=(1/a^12 ): (1/-2x^3y)^12=[(1/a)*(-2x^3y/1)]^12=-2^12*x^36*y^12 / a^12=
=-(2*x^3y)12/a^12=[(-2x^3y)/a ]^12