Question

Eliminar parentesis y signos
a) (2+9)-(-9)=
b) (5-4)+(+7)=
c) (-6-7)-(-5)=
d) 4+7-12-1=
e) 8-(-16)=

Answer 1

2+9_9

5-4+7

6-7-5

4+7-12-1

8-16

Answer 2

a) (2+9)-(-9)=
11 + 9 = 20
b) (5-4)+(+7)=
1 + 7 = 8
c) -(6-7)-(5)=
-(-1)-(5)
1 - 5 = -6
d) 4+7-12-1= -2

e) 8-(-16)=
8 + 16= 24