=
□○□○□=□(个)
9+1= 7-5= 5+4= 9-6= 8-6 + 2=
10-5= 6+2= 5-1= 4+3= 10 -7+4=
8-8= 0+9= 6-5= 4+5= 8-5 +7 =
6+4= 8-6= 9-3= 7-6= 2 + 7- 6=
0
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
+5=19 15-=5 -3=12
+0=18 2+=17 -=11
6+=16 +=14 -=7