Question

Resolva:
a) {30+[10 -5 +(-2 -3) ] -18 -12}=
b) 25 -[-5 -( +2-5 -1 )+3]+9=
c) 12+{+5-[+2-(+9-6)]}=
d) -(+4) -(-4) +(-7) -(-2)=
.

Answer 1

Resposta:

a) {30+[10 -5 +(-2 -3) ] -18 -12}=

{30+[10 -5 - 5 ] - 30 }=

{30+[ 0 ] - 30 }=

{30 - 30 }= 0

b) 25 -[-5 -( +2-5 -1 )+3]+9=

25 -[-5 -( - 4  )+3]+9=

25 -[-5 + 4  +3]+9=

25 -[ + 2 ]+9=

25 - 2 +9= 32

c) 12+{+5-[+2-(+9-6)]}=

12+{+5-[+2-(+ 3)]}=

12+{+5-[+2- 3]}=

12+{+5-[ - 1 ]}=

12+{+5 + 1 }=

12+ 6 = 18

d) -(+4) -(-4) +(-7) -(-2)=

- 4 + 4 - 7 +2 = - 5