9-1=
5-3=
4-2=
7-1=
9-2= 9-4= 8-= 8-=
填一填,想一想.
8-3=2+
4+=6
□○□=□
3+3= 0+1= 6-4= 7-1=
6-6= 4+2= 3+4= 5-2=
2+2= 7-5= 0-0= 1+4=
4-1= 2+1= 3+0= 6-5=