a) (+8)-(+5)=8-5=3; (+8)-(-5)=8+5=13; 7-(-3)=7+3=10; (-10)-(-3)=-10+3=-7; (+10)-(-4)=10+4=14; (-5)-(-6)=-5+6=1; (-7)-(+7)= -7-7=-14; (-5)-(+9)= -5-9=-14; b) (-15)-(-13)-(-20)=-15+13+20= -2+20=18; 14-(-3)-(+7)=14+3-7=17-7=10; -1-(+3)-(-5)-(+7)-(+16)= -1-3+5-7=-4-2=-6; c) 25-(+3)-(-7)-(+6)-(+24)= 25-3+7-6-24=22+1-24=23-24=-1; (-16)-(-24)-(-25)-(+26)= -16+24+25-26= 8-1=7; -125+321-(-125)-(+220)+(-230)= 196+125-220-230= 321-450=-129
Sper ca te-am ajutat! :)