Question

1) Calcule:
a) (- 5) - (–3) - (–7) =
b) (- 8) - (- 2) - (- 6) =
c) (- 3) - (- 2) - (–5) =
d) 45 - (+75) - (+10) =
e) 39 - (- 26) - (- 18) =
f) 50 - (+14) - (- 20)=

2) Calcule:
a) (+8) + (+9) =
b) (- 12) + (- 9) =
c) (- 20) + (+ 7) =
d) (+ 4) + (- 10) =
e) (+ 25) + (+ 15)=
f) (+ 386) + (- 108) =
g) (- 78) + (- 39) =
h) (- 117) + (+ 225) =
i) (+ 88) + (+ 99) =
j) (+ 446) + (- 890) =

eu preciso pra hojeeeee
dou 100 pontos
prf

Answer 1

Olá!!!

Resposta...

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Questão 1

= ( -5 ) - ( -3 ) - ( -7 )

Aplique a regra: - ( -a ) = +a

= ( -5 ) +3 - ( -7 )

= -2 - ( -7 )

Aplique a regra: - ( -a ) = +a

= -2 +7

= 5

________________________

= ( -8 ) - ( -2 ) - ( -6 )

Aplique a regra: - ( -a ) = +a

= ( -8 ) +2 - ( -6 )

= -6 - ( -6 )

Aplique a regra: - ( -a ) = +a

= -6 +6

= 0

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= ( -3 ) - ( -2 ) - ( -5 )

Aplique a regra: - ( -a ) = +a

= ( -3 ) +2 - ( -5 )

= -1 - ( -5 )

Aplique a regra: - ( -a ) = +a

= -1 +5

= 4

________________________

= 45 - (+75) - (+10)

= -30 - (10)

= -40

________________________

= 39 - (-26) - (-18)

Aplique a regra: - ( -a ) = +a

= 39 + 26 - (-18)

= 65 - (-18)

Aplique a regra: - ( -a ) = +a

= 65 + 18

= 83

________________________

= 50 - (+14) - (-20)

= 36 - (-20)

Aplique a regra: - ( -a ) = +a

= 36 + 20

= 56

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Questão 2

( +8 ) + ( +9 ) = 17

( -12 ) + ( -9 ) = -12 -9 = -21

( -20 ) + ( + 7 ) = -20 +7 = -13

( +4 ) + ( -10 ) = 4 -10 = -6

( +25 ) + ( +15 ) = 40

(+ 386) + (- 108) = 278

(- 78) + (- 39) = -78 -39 = -117

(- 117) + (+ 225) = 108

(+ 88) + (+ 99) = 187

(+ 446) + (- 890) = -444