Question

Determine o valor das seguintes expressões numéricas:
por favor resolva não coloque só a resposta.

a)2-[4×(7-12)-5]

b)2-+[(4)×(-7+12)+5]

c)13-[(-1)×(4-5)-2×(-1)]

d)13+2×[-7-5×(-9+4)]

e)-20-5[(-2)×(4-7)+8-2×5]

f)-20-6×[(-1)×(10-3×7)+8-5×4]

Answer 1

a)
= 2 - [4.(7 - 12) - 5]
= 2 - [4.(-5) - 5]
= 2 - [ - 20 - 5]
= 2 - [ - 25]
= 2 + 25
= 27

******************************
b)
= 2 - [(4)×(-7+12)+5]
= 2 - [ 4 . 5 + 5]
= 2 - [ 20 + 5]
= 2 - 25
= - 23

***********************************
= 2 + [(4)×(-7+12)+5]
= 2 + [ 4 . 5 + 5]
= 2 + [ 20 + 5]
= 2 + 25
= 27

********************************
c)
= 13 - [(-1) .(4-5) - 2.(-1)]
= 13 - [ - 1 . ( - 1) +  2]
= 13 - [ 1 + 2]
= 13 - 3
= 10

***********************************
d)
= 13 + 2. [- 7 - 5.(- 9 + 4)]
= 13 + 2.[ - 7 - 5.( - 5)]
= 13 + 2.[ - 7 + 25]
= 13 + 2. 18
= 13 + 36
= 49

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)
= - 20 - 5.[(-2) .(4- 7 ) + 8 - 2.5]
= - 20 - 5.[ - 2 . (-3) + 8 - 10]
= - 20 - 5.[ 6 - 2]
= - 20 - 5.3
= - 20 - 15
= - 35

******************************
f)
= - 20 - 6.[(-1).(10 - 3.7) + 8 - 5.4]
= - 20 - 6.[ - 1 . (10 - 21) + 8 - 20]
= - 20 - 6.[ - 1 . (-11) - 12]
= - 20 - 6.[ 11 - 12]
= - 20 - 6.[ - 1]
= - 20 + 6
= - 14