Question

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

Answer 1

  = 20 – {–10 – [–8 + ( 5 – 12 )] – 20}
 
= 20 – {–10 – [–8 + ( -7)] – 20}

= 20 – {–10 – [–15] – 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) + [–8] x (–1)} x {(–8) + (–7)}

 ={(–1) + [–8] x (–1)} x {–15}

={(–1) + 8} x {–15}

={+7} x {–15}

= -105