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a- 9+5=14
b-11+15=26
c-0,7+0,8=1,5
d-1,5+1,2=2,7
e-1/2+1/4=0,5+0,25=0,75
f-1/3-1/10=10/30-3/30=7/30
zad2
a- 4+2=6
b- 5-3=2
c- 0,5+0,4=0,9
d- 0,1-0,2=-0,1
e- 3+5=8
f- 2-0,2=1,8