Question

12-(4+20)-9=

19-(3+12-6)+9=

-9+(-4-3+1)-(-2-3+2)

15+(-2+7-2)-(6-13+3)=

Answer 1

Olá, bom dia ☺

a)

12-(4+20)-9
12-24-9
-12-9
= - 21

b)

19-(3+12+6)+9
19-9+9
10+9
= 19

c)

-9 + ( -4-3+1) -  (-2-3+2)
-9 + ( - 6) - ( -3)
-9 - 6 + 3
- 15 + 3
= - 12

d)

15 + ( -2+7-2) - (6-13+3)
15 + 3 + 4
18+4
= 23

Bons Estudos :)