15-7= 13-8= 12-4= 15-5=
12-8= 11-7= 18-9= 14-5=
4+6= 12-9= 11-9= 16-9=
19-9= 13-7= 14-7= 17-9=
2=-0 -=1 =1+8
+5=9 -4=5 +=9
+3=4 8+=8
4+8= 14﹣6= 16﹣9= 68﹣8= 12﹣4+70=
18﹣9= 17﹣8= 9+2= 46﹣6= 3+10﹣3=
11﹣3= 12﹣5= 8+5= 39﹣( )=30 ( )+( )=48
20+70=
37-8=
62-2=
45+9=
18-9=
5+70=
100-60=
11-7=
65-5=
38-15=
99-80=
13+30=
48-26=
46+33=
30+61=
87-14=
40+30= 84-50= 37+8= 72-7=
100-40= 6+35= 30+43= 63+7=
15+5+42= 48+(17-8)= 30-8-20=
73-(21+9)= 54+7-40= 15+(58-50)=