5
[
A
B
C
D
3
6+7-8=
[ ]
A.5
B.9
C.15
18-9+1=
A.7
B.8
C.10
D.12
5+6-9=
A.2
B.5
C.7
D.13
11-6+8=
5+3-6=
4+8-7=
5+9-7=
15-7-3=