Explicație pas cu pas:
a)(-5+3)+(-7+8)+(-9+2)=
-2-7+8-9+2=
-9+8-9+2=
-1+9-2=
-10+2=
-8
b)(-4+1)+(-8+11)+(-7+20)=
-3-8+11-7+20=
-11+11-7+20=
0-7+20=
-7+20=
13
c)(-8+3)+(-4+9)+(-5+0)=
-5-4+9-5+0=
-9+9-5+0=
0-5+0=
-5+0=
-5
d)(-7+10)+(-5+12)+(-3+15)=
3-5+12-3+15=
-2+12-3+15=
10-3+15=
7+15=
22
e)(-15+12)+(-8+16)+(-3+6)=
-3-8+16-3+6=
-11+16-3+6=
5-3+6=
2+6=
8
f)(-8+2)+(-8+15)+(-3+10)=
-6-8+15-3+10=
-14+15-3+10=
1-3+10=
-2+10=
8
g)(-9+3)+(-16+4)+(-5+8)=
-6-16+4-5+8=
-22+4-5+8=
-18-5+8=
-23+8=
-15
h)(-3+7)+(-9+2)+(-5+15)=
4-9+2-5+15=
-5+2-5+15=
-3-5+15=
-8+15=
7
