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a)125+(-6)+(-24)+30= 125+30 + (-6+(-24))=125+30+(-30)=125
b)-16+(-40)+(-7)+67+66=-63+67+66=4+66=70
c)2i 2/5+17 i3/5+ (-4,1+(-5,9))=19i5/5+ (-10)=20+(-10)=10
d) 5 i4/7+ (-1i4/7) + 5,4+(-7,4)= 4+ (-2)=2
e)6,3+(-6,3) + (-0,75)+(-0,25) +(-3,1)= 0+(-1)+ (-3,1)=-4,1