Question

Determine o valor das expressões numéricas:
A- 3-[5.(4-8)-3]
B- 13+4.[-5+3.(9+5)]
C- -30-4.[(-2).(12-4.5)+9-6.3]
D- 15+2[-4-3.(-8+3)]

Answer 1

Olá.

a)
3-[5.(4-8)-3]
3-[5.(-4)-3]
3-[-20-3]
3-[-23]
3+23 =26

b) 13+4.[-5+3.(9+5)]
13+4.[-5+3.14]
13+4.[-5+42]
13+4.37
13+148 = 161

c) -30-4.[(-2).(12-4.5)+9-6.3]
-30-4.[(-2).(12-20)+9-18]
-30-4.[(-2).(-8)-9]
-30-4.[16-9]
-30-4.7
-30-28 = -58

d) 15+2[-4-3.(-8+3)]
15+2[-4-3.(-5)]
15+2[-4+15]
15+2[+11]
....


Espero ter ajudado.

Answer 2

Olá,

Vamos lá,

A- 3-[5.(4-8)-3]
=3 - [ 5.( -4)-3]
= 3 - [ -20 - 3]
= 3 + 23
= 26



B- 13+4.[-5+3.(9+5)]
=13 + 4[ - 5 + 3.(14)]
= 13 + 4[ - 5 + 42]
= 13 + 4[37]
= 13 + 148
= 161


C- -30-4.[(-2).(12-4.5)+9-6.3]

= -30 - 4[ -2 ( 12 - 20) +9-18]
= -30 - 4[ -2 (-8) + 9 -18]
= -30 - 4 [ 16 + 9 -18]
= -30 - 4 *7
= -30 - 28
= -58

D- 15+2[-4-3.(-8+3)]
= 15 + 2[ -4-3(-5)]
= 15 + 2[ - 4+15]
= 15 +2 [ 11]
= 15 + 22
= 37

Bons estudos !!!