16->9 24->3 11<15- -5<8
15-8=
16-7=
29-9=
13-4+8=
13-9=
11-8=
15-10=
6+6-9=
12-6=
14-5=
68-8=
17-8+3=
31+8= 20+39= 36-24= 65-35=
不够 够
13-4=
50+8=
2+90=
14-6=
13-5+9=
88-80=
40+3=
64-4=
7+50=
19-10-7=