3941 7880 16<
9669 10099 <50
15-6= 13-5= 54-4= 11-7+6=
17-8= 11-6= 70-10= 14-9-2=
14-6= 75+4= 30+24= 20+30+40=
12-5= 18-9= 37+2= 40+60-70=
11-2=
14-9=
12-3=
13-5=
14-7=
15-9=
11-8+5=
8+8-9=
13-5=
60+6=
15-9=
39-9=
6+90=
16-9=
18-6=
15-7=
33-30=
20+10=
6+14=
8+40=
62-4062-4 26+3086-30 45-945+9
82-181-2 47+545+7 3元5角5元3角
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=