12-7=
16-9=
9+60 =
40-4=
87-70 =
54-8 =
38 +9 =
14-7=
34+3+7=
56-(3+47)=
35+60-70=
15-9〇9 45-5〇40 57-50〇5
52-20=
52-2=
98-80=
98-8=
68-3=
68-30=
40+30+8=
90-10-60=
26+40-4=
87-70+3=
63-(14+6)=
53-(37-7)=
44+33=
27+12=
47-25=
92-81=
41+48=
88-38=
85-40=
20+80=
59-50=
37+13=
50-7=
45-6=
5+37=
78+20=
38+9=
28-9+40=
45-40+32=
28-10+9=
25+9-6=
17-8= 11-3= 53-50= 6+2+8=
40+2= 16-7= 17-9= 78-70+3=
89-9= 6+8= 82+7= 65-60+80=
75-30= 54+3= 65-5= 8-5+30=