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b. 1 i 1/8 - 2 i 1/4 -(-0,5)=9/8 -18/8+0,5=-9/8+1/2=-9/8+4/8=-5/8
c. (-2,1)+1/5-3=-21/10+2/10-3=-1 i 9/10-3=-2 i 1/10
1 1/8-2=1/2-(-0,5)=
1 3/8-(-0,5)=-7/8
-2,1=1/5-3=-2,3-3=5,3