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b)-31+16-3-12+24 = -15-3-12+24=-18-12+24=-30+24=-6
c)22,5-24+2,5-6+3 = -1,5+2,5-6+3=1-6+3=-5+3=-2
d)3,5-2-21,5+4-8,5 = 1,5-21,5+4-8,5= -20+4-8,5= -16-8,5= -24-5=-24,5
e)-3,6+2,5-1,4-(-2,5) = -1,1-1,4+2,5= -2,5+2,5= 0
f )-5,75+4-2,25-(-3) = -1,75-2,25+3= -4+3= -1