1+3=
2+5=
3+6=
4+7=
9+4=
8+3=
7+2=
6+1=
3-1=
5-2=
7-4=
8-7=
9-6=
9-3=
7-1=
10-3=
2+8+3=
4+5-7=
7-2+3=
3+4+
=9
9-8+
=5
4+
+1=6