Question

Calcule o valor das expressoes.

a) (-10)-(-8) + (-2) -(+5) + (-3) =

b) (20 - 25) -5+ ( 18 -7 + 5)

c) 8-(-6) + (-5)+(8-3 +5-10 +12) =

d) (+3-10-5+7-12)-(-8+3-4+6-18) =

e) +10 + (-6-3)-4-(+8-5)-(-7+ 12) =

f) + 14 -21 45-6-8 + 35-50 + 21 g)+8-5+3 -4+ 7 - 2 + 6 =

(expliquem pfv)​

Answer 1

Resposta:

Explicação passo-a-passo:

a) (-10)-(-8) + (-2) -(+5) + (-3)

= -10 +8 - 2 - 5 - 3

= - 2 - 7 - 3

= - 9 - 3

= - 12

____________

b) (20 - 25) -5+ ( 18 -7 + 5)

= -5-5 + (11+5)

= -10 + 16

= 6

_____________

c) 8-(-6) + (-5)+(8-3 +5-10 +12)

= 8+6 - 5 + (5-5+12)

= 14-5 + (12)

= 9+12

= 21

__________

d) (+3-10-5+7-12)-(-8+3-4+6-18)

= ( -7 + 2 - 12) - ( - 5 + 2 - 18)

= ( -5 -12) - ( - 3 - 18)

= - 17 - (-21)

= -17+21

= 4

__________

e) +10 + (-6-3)-4-(+8-5)-(-7+ 12)

= 10 +(-9) - 4 - (3) - (5)

= 10-9 - 4 - 3 - 5

= 1 - 7 - 5

= 1 - 12

= - 11

________

f)

= + 14 -21 + 45-6-8 + 35-50 + 21

= - 7 + 45-14 - 15 + 21

= 38 - 29 + 21

= 9+21

= 30

__________

g)+8-5+3 -4+ 7 - 2 + 6 =

= 3 - 1 + 5 + 6

= 2 + 11

= 13