63-7= 73-8= 65-6= 47+30=
38-13= 28+50= 49+20= 19-6=
20+43= 48-30= 65-60= 35+8=
25+(42-30)= 90-50+42= 85-(45-5)= 40+6+20=
54-8□ 73-6□
45-8□ 73-9□
15支
36支
47支
70-40= 12-8= 23+5= 13+7+54=
32-7= 39-6= 70+7= 40+(13-6)=
6+6= 34-30= 6+50= 75-(10+50)=
16-8= 40+2= 15-6+7= 7+10-9=
78-8= 16-9= 17-9+8= 12-5-4=
12-9= 17-8= 14-4-2= 3+9-5=
60+7= 20+9= 87-7= 55-50=
78-20= 67-7= 90-40= 7+62= 17-8= 18-9=
43-20= 13-7= 75-5= 7+32= 12-5= 38-5=