15-7=
4+9=
12-6=
17-8=
14-4=
8+9=
11-5=
16-7=
16-8=
5+6=
14-9=
13-5=
6+7=
10-3=
5+9=
17-8= 36+3= 46-4= 72+8=
40+60= 20-7= 58+4= 89-8=
67+8= 100-10+6= 27-9+10= 68-(20+30)=
11-2= 13-5= 15-7= 16-8=
14-6= 12-8= 18-10= 19-9=
9+5-7= 8+8-7= 17-10+5= 15-7-6=
87- 80= 96-90= 50+9= 16-8+6=
56-50= 98-8= 70+7= 90+9=
14-6= 76-70= 6+20= 40+9= 25-5+7=
5+30= 15-9= 2+50= 30+4= 32-2+8=
58-8= 4+20= 7+30= 59-50= 50+5-5=
67-7= 80+8= 11-7= 74-4+3= 40+6+1=
2+37=
87-24=
20+80=
13-9=
11-8=
42+16=
97-60=
50+3=
写作:读作:
A.(1,1)
B.(3,1)
C.(3,2)