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b)[6^4:(0,5)^4]* -1/12^4=12^4*-1/12^4=-1^4=1
c)(3^-2 + 3^-1)^-2= ( 1/9 + 3/9 )^-2 = 9^2/4^2 = 81/16
d)2*4^3*8^-2/2:2^3=2^1*2^6*2^-6/2^-2=2/2^-2=2^3=8