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