Question

Elimine os parênteses (ou colchetes ou chaves) e efetue as operações:
a)-25+(+30)+(-2)+(-10)
b)(+10)+(+3)+(+12)+(-11)+(-2)
c)(-10)-(-7)-(+8)-(+9)+(+3)
d)-(-3+7)+(2-5)-9
e)-[5+(3-6)-(9-13)]

Answer 1

a) -25+30-2-10=
5-12=-7
b) 10+3+12-11-2=
25-13=12
c) -10+7-8-9+3=
-3-17+3=
-20+3=
-17
d) -(-3+7)+(2-5)-9=
3-7+2+5-9=
-4+7-9=
3-9=
-6
e) -[5+(3-6)-(9-13)]=
-5+(-3)-(-4)=
-5-3+4=
-8+4=
-4

Answer 2

a)-25+(+30)+(-2)+(-10) = -25+30-2-10 ( junta os termos semelhantes)= -37+30= -2
b) (+10)+(+3)+(+12)+(-11)+(-2)= +10+3+12-11-2= +25-13= +12
c)(-10)-(-7)-(+8)-(+9)+(+3) = -10+7-8-9+3 = -27+10= -17
d)-(-3+7)+(2-5)-9 = +3+7+2-5-9 = +12-14 = -2
e)-[5+(3-6)-(9-13)]= -[5+3-4] = +8-4= +4