:,时
□○□○□=□(个)
-=
□□□□□□□
3+2= 4–4= 5+3= 8–7=
6–3= 5–2= 0+4= 8–8=
2+2= 8+1= 9–3= 9–2=
4+1= 10–1= 6+4= 8-6+2=
5+5= 8–2= 10–7= 4+4–4=
□○□=□