13-5=
60+6=
15-9=
39-9=
6+90=
16-9=
18-6=
15-7=
33-30=
20+10=
6+14=
8+40=
20-10+7=
79-9+6=
8+50-8=
13-9+30=
60+2-60=
10+4-5=
= (个) = (个)