缺块
这面墙缺了块砖。
15-8+6=
14-8+5=
6+7-8=
10+2-8=
2+9-8=
17-8-4=
12-4-3=
14-5-2=
18-9-9=
11-2-3=
15-5-2=
13-9-1=
18-4-7=
19-3-8=
17-8-5=
11-3-4=
14-7-3=
15-6-3=
18-6-4=
9-5-3=
17-4-5=
17-9-6=
14-9+3=
18-9-2=
12-9+5=
13-9-2=
19-9+3=
7+8-9=
11-9+6=