Question

5) Efetue as expressões: a) 18 – (–18) + 7 + (–7) + 0 – 4 b) –21 – 6 + 7 – (–15) –2 – (–10) c) –45+ 7 + (–8) + (–3) – 2 – 4 + 1 d) 10 – (–12) + (–8) + (–9) – 6 +1 +5 e) 20 : 2 + (–7) = f) –8 + 12 : 3 = g) 6 : (–2) +1 = h) (–7) . ( –3) + (–4) = i) (–10) + (+3) . (–4) = j) (–15) : (–3) + 7 = k) 40 – (–25) : (–5) = l) 20 + (–10) . (–5) =

Answer 1

Resposta:

$a) 18 - ( - 18) + 7 + ( - 7) + 0 - 4 = \\ 18 + 18 + 7 - 7 + 0 - 4 = \\ 36 - 4 = 32$

$b) - 21 - 6 + 7 - ( - 15) - 2 - ( - 10) = \\ - 27 + 7 + 15 - 2 + 10 = \\ - 20 + 13 + 10 = \\ - 7 + 10 = - 3$

$c) - 45+ 7 + ( - 8) + ( - 3) - 2 - 4 + 1 = \\ - 38 - 8 - 3 - 6 + 1 = \\ - 46 - 9 + 1 = \\ - 55 + 1 = - 54$

$d) 10 - ( - 12) + ( - 8) + ( - 9) - 6 +1 +5 = \\ 10 + 12 - 8 - 9 - 6 + 6 = \\ 22 - 17 = 5$

$e) 20 : 2 + ( - 7) = \\ 10 - 7 = 3$

$f) - 8 + 12 : 3 = \\ - 8 + 4 = - 4$

$g) 6 : ( - 2) +1 = \\ - 3 + 1 = - 2$

$h) ( - 7) . ( - 3) + ( - 4) = \\ 21 - 4 = 18$

$i) ( - 10) + (+3) . ( - 4) = \\ - 10 - 12 = - 22$

$j) ( - 15) : ( - 3) + 7 = \\ + 6 + 7 = 13$

$k) 40 - ( - 25) : ( - 5) = \\ 40 - ( + 5) = \\ 40 - 5 = 35$

$l) 20 + ( - 10) . ( - 5) = \\ 20 + 50 = 70$

Espero ter ajudado!

Se puder avaliar minha resposta, ajudaria muito;)