97-4=
65-5=
87-7=
24+=54
-30=29
78-34=
56-42=
35-23=
86-36=
72-21=
92-11=
76-26=
50+30= 17+30= 48-7= 30+26= 90-80=
10+78= 38-20= 32+7= 4+20= 70+6=
67-50= 25-3= 4+25= 68-60= 36-6=
99-6= 67+2= 87-7= 96-60= 32+50=
32+5= 5+71= 29-5= 49-4= 5+32=
50+6= 62-7= 7+21= 20+25= 87-52=
□○□=□(个)
50+2090-8 36+1955 4353-4
7+256+24 36+2450 78-868+2 82+790
18+3020+28 67+2080+6 50-540+5