28+8= 60+24= 6+24= 45-6+30=
15-7= 19-9= 9+79= 40+22-9=
75-6= 86-60= 35+30= 53+(25+5)=
57-6= 58-50= 40+50= 86-(20+10)=
(个)
23-9= 46-8= 20+50= 82-(43+7)=
80-40= 79-20= 57-5= 46-(17+3)=
24-6= 87-7= 63+20= 27+3+3=
32-2= 89+1= 12+10= 28-4-4=
12-3= 11-7= 63+30= 74-30=
9+25= 70-40= 36+20 = 60+21=
46-8= 27+30= 12-5= 95-9=
30+20= 50+8= 45+8= 64-10=
30-4= 50-6= 70-8= 80-3= 60-2=
21-8= 32-6= 43-4= 54-9= 65-8=
76-9= 87-8= 91-3= 35-8= 23-5=
44-5= 36-9= 23-8= 54-6= 60-8=
86﹣6 66
61+7 87
18﹣8 12﹣4
6+40 64
75﹣30 35
40+0 40﹣0