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a)
1/3+2/5=11/15
1/3=5/15
2/5=6/15
1/3+2/5=5/15+6/15=11/15
b)
5/7+1/4=27/28
5/7=20/28
1/4=7/28
5/7+1/4=20/28+7/28=27/28
zad4
a)1/6+5/8
1/6=4/24
5/8=15/24
1/6+5/8=4/24+15/24=19/24
b)
5/6+4/9
5/6=15/18
4/9=8/18
5/6+4/9=15/18+8/18=23/18=1 5/18
zad5
a)
2/15+3 1/6=4/40+3 5/30=3 9/30
b)
5 5/12+1 4/9=5 15/36+1 16/36=6 31/36
c)
4 7/8+7 5/6=4 21/24+7 20/24=11 41/24=12 17/24
d)
13 1/15+6 2/25=13 5/75+6 6/75=19 11/75