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4*(-1/2)-2=-2-2=-4
b)
1/4+1/4=1/2
c)
-2*(-1/2) + 1=1+1=2
d)
-1/2 * (2*(-1/2)+1)=-1/2 * (-1+1)=-1/2 * 0 =0
Odp. D
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