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A] 5-(-3)=5+3=8
B] 7-2=5
c] -4-(-5)=-4+5=1
d] 6-(-8)=6+8=14
b)
a]2,5-(-2,5)=2,5+2,5=5
b] 3/4-1/4=2/4=0,5
c] -1,5-(-3,6)=-1,5+3,6=2,1