Question

= (12 + 13): (+ 5-30) -4:(+3 - 7)-(-4-8),
Com cálculos MONTADOS

Answer 1

12+13=25

5-30=-25

3-7=-4

-4-8=-12

$\mathtt{(12+13):(+5-30)-4:(+3-7)-(-4-8)}$

$\mathtt{(25):(-25)-4:(-4)-(-12)}$

$\mathtt{-1+1+12=12}$