Question

ade avaliativa
c) - { 20-(2 - 10 ) + [ - 30 - (- 70 )]} =
​

Answer 1

-{20-(2-10)+[-30-(-70)]}

=-{20-(-8)+[-30+70]}

=-{20+8+[40]}

=-{20+8+40}

=-{68}

=-68