Question

Álgebra elementar - Como eu resolvo essas contas: ME AJUDEM!!!

a) –(+4 – 3) + (–7 + 2) – [(–1) + (–2 + 3)]

b) (–2) . (3) – (–3) . (–8) + (–3) . (–4)

c) –5 . 3 – 9(–2) + (–5)(–9)(2) – 2 . (–2)

Answer 1

A) -(1) + (-5) - [-1 + 1]
    -1 -5 -0
    -6

B) -6 -(+24) + (+12)
    -6 -24 +12
   -30 +12
   -18

C) -15 +18 + 90 +4
    -15 +112
    97