11-8=
17-9=
16-7=
3+8-9=
13-5=
13-9=
18-9=
12-5+8=
12-7=
12-8=
17-8=
13-8+6=
16-9=
12-3=
12-9=
4+9-7=
11-7=
16-8=
14-9=
7+7-8=
7+7= 34+5= 41+9= 75-30= 10+(99-9)=
18-6= 20-3= 28+6= 53-40= 56-5-10=
50+4= 73+8= 35+9= 6+17= 77-(7+2)=
11-8= 90-30= 84-80= 50-50= 59-30+4=
(盒)
29
31
32