Resposta:
Explicação passo-a-passo:
a.
5-(1-7-4)+10=
5-(-6-4)+10=
5-(-10)+10=
5+10+10=
15+10=
25
b.
10+(-5+4-3)+8=
10+(-1-3)+8=
10+(-4)+8=
10-4+8=
6+8=
14
c.
8+(4-7-3)+11=
8+(-3-3)+11=
8+(-6)+11=
8-6+11=
2+11=
13
d.
12+5-4+3-2=
17-4+3-2=
13+3-2=
16-2=
