11-3=
8+6=
13-4=
17-8-6=
87-7=
20+6=
15-9=
15-7+4=
10-2=
14-7=
69-9=
76-6+5=
42-5=
先算:
再算:
40+8= 70+6= 60+8= 13-6= 58-8=
17-9= 12-5= 35-5= 15-7= 13-6=
17-6+6= 22-2+3= 13-0+0= 5+6-8= 44-4=
12-7= 14-6= 8+5= 11-4= 18-9=
4+9= 16-7= 14-7= 13-6= 15-8=
11-5= 9+5= 11-2= 16-9= 13-4=
13-6= 12-6= 15-9= 11-4=
13-7= 18-9= 15-7= 8+5=
12-5 30+9 9+8 48-40 73-3
>>>>。