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