zad.1
3/4-1/2=3/4-2/4=1/2
1i1/2+1/4=1i2/4+1/4=1i3/4
3i3/4-1/2=3i3/4-2/4=3i1/4
10i3/4-2i1/2=10i3/4-2i2/4=8i1/4
5i1/4+3i1/2=5i1/4+3i2/4=8i3/4
zad.2
1/4+3/8=2/8+3/8=5/8
5/6-1/3=5/6-2/6=3/6=1/2
zad.3
2/5+3/10=4/10+3/10=7/10
2/3+1/6=4/6+1/6=5/6
2/3+2/9=6/9+2/9=8/9
1i1/5+2i7/10=1i2/10+2i7/10=3i9/10
zad.4
a)5/8
b)3/4
c)9/16
d)1/2