Question

Resolva as expressões: a) 20 – {–10 – [–8 + ( 5 – 12 )] – 20} b) {(–1) + [(–6) – (–3 +5)] x (–1)} x {(–8) + (–5 +6) x (–7)} c)

Answer 1

Olá,

Vamos lá,

a) 20 – {–10 – [–8 + ( 5 – 12 )] – 20}

= 20 - { - 10 -[ -8 - 7]-20}
= 20 - { -10 + 15 - 20 }
= 20 - { -15}
= 20 + 15
= 35


b) {(–1) + [(–6) – (–3 +5)] x (–1)} x {(–8) + (–5 +6) x (–7)}
= {(–1) + [(–6) – (2)] x (–1)} x {(–8) + (1) x (–7)}
= { -1 + [ -6 -2 ] x ( -1)} x { -8 +1 * -7}
= { -1 - 8 * -1} x { -8 - 7 }
= { -1 + 8} x ( - 15}
= 7 * - 15
= - 105