9. Efectuați: a) 3-(-7+2)+(-5)+(-3-1+4)-(-7)=; b)-7-(3+2-6-1)+(-6+3-1)=; c) 5+(2–8–3)-(-9+7)+(-3)-2+1 =; d) -15+(-3+2-1)-(-7+5-2-9)=; e) 6+(3+8)+(-6)+(-6--12+3-1)=; f)-24-8+6--13+11-1)-(-2) = .
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Explicație pas cu pas:
a) 3-(-7+2)+(-5)+(-3-1+4)-(-7)=
3+7-2-5+0+7
10-7+7= 10
b) -7-(3+2-6-1)+(-6+3-1)=
-7-3-2+6+1-6+3-1= -9
c) 5+(2-8-3)-(-9+7)+(-3)=
5+2-8-3+9-7-3-2+1= -6
d) -15+(-3+2-1)-(-7+5-2-9)
-15-3+2-1+7-5+2+9= -4
e) 6+(3+8)+(-6)+(-6-12+3-1)
6+3+8-6-6-12+3-1= -5
f) -24-8+6-13+11-1-(-2)
-24-8+6-13+11-1+2= -27
Sper că te-am ajutat!!!!