Question

elimine os pareteses e calcule :

a) 7-(-6)-(-8)
b)-8+(-6)-(+3)
c)5-6-(+7)+1
d)-28+7+(+12)+(-1)-6
e)-21-7-6-(-15)-2-(10)
f)10-(-8)+(-9)-(-12)-6+5

Answer 1

a)7-(-6)-(-8)
7+6+8
13+8
21

b)-8+(-6)-(+3)
-8-6-3
-14-3
17

c)5-6-(+7)+1
5-6-7+1
-1 -8
-8

d)-28+7+(+12)+(-1)-6
-28+7+12-1-6
-21+12-7
-21+5
-16
e)-21-7-6-(-15)-2-(10)
-21-7-6+15-2-10
-28-6+13-10
-34+3
-31
f)10-(-8)+(-9)-(-12)-6+5
10+8-9+12-6+5
18+3-1
18+2
20