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=[ ( 1/2)^2 ]^2 = (1/2)^4 = 1/16
=6^-1 : 6^ -2 = 6^ 1 = 6
b) [(1/2) ² : (1/2) ⁰]²=(1/4 ·1)²=1/16
d) (6 ⁻²· 6) : 6⁻²= (1/36 · 6) · 36 = 6