7 � (10 + 3 ? 6)
1
9 � 9 � (8 + 7)
15
4 � (8 ? 6) � 2
1
10 � 5 � 3 � 3
18
10 + 8 � 1 ? 5
13
(4 + 1 + 4) � 3
3
1 � 2 � (4 ? 2)
4
(10 ? (10 ? 8)) � 2
16
10 + 9 � (3 � 3)
11
10 � ((1 + 5) � 6)
10
5+4?3+9
15
4+1+6?4
7
2 � 2 � (10 ? 9)
4
8+3�1+9
20
10 � (4 ? 2) � 1
5