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b) -31+16-3-12+24=-15-3-12+24= -30+24= -6
c) 22,5-24+2,5-6+3=-1.5+2,5-6+3= -5,5+3= -2,5
d) 3,5-2-21,5+4-8,5= -20+4-8,5=-24,5
e)-3,6+2,5-1,4-(-2,5)= -2,5 + 2,5=0 (bo - i - daje +)
f) -5,75+4-2,25- (-3)= -4 + 3= -1
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