计算7+5= 9+3= 7+8= 8+5= 7+4=9+8= 7+9= 8+7= 7+7= 7+6=
10-6= 8-6= 8-5= 8-3= 5-4= 5-1=
4+2= 7-4= 7-6 = 10-8= 10-3= 5+3=
6+3= 7+2= 9+1= 7+1= 8-5= 6-3=
8-4= 6+0= 5+2= 10-9= 10-8= 8+2=
9-4= 10-3= 9-3= 10-7= 7-5= 6-4=