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(4^3)^(-2):64^(-3)=4^(-6):(4^3)^(-3)=4^(-6):4^(-9)=4^[-6-(-9)]=4^(-6+9)=4^3=64
B) (4³)^-2 : 64^-3 = 64^-2 : 64^ 3 = 64^-2 -(-3)= 64^-2+3 = 64^1 = 64