Question

1) a) -(-2)-7-(-18+4+(7-15)
b) ([73-64)+20)-{40-31}+(-3)

Answer 1

1) a) -(-2)-7-(-18+4+(7-15)
+2 -7 -(-18+4-8)=
+2-7-(-14-8)=
+2-7-(-22)=
+2-7+22=
-5+22=+17


b) ([73-64)+20)-{40-31}+(-3)
(9+20)-{9}-3=
29-9-3=
20-3=17