Question

1- Resolva as expressões numéricas :
a) {(-2)+[(-4-2)+(-1).(+2)+20}

b) 25+{14-25.4+40-(20÷2+10)]} ​

Answer 1

a){(-2)+[-6+(-2)]+20}
={-2+(-8)+20}
={-10+20}
=10

b)25+{14-[100+40-(10+10)]}
=25+{14-[140-20]}
=25+{14-120}
=25+106
=131