竖式计算:315×3= 375×4=
7-4= 6-0= 5-2= 10-9= 10-8= 8-2=
5-3= 7-2= 9-1= 7-1= 8-5= 6-3=
6-5= 7-4= 7-6 = 10-8= 10-3= 5-3=
8-2= 8-6= 8-5= 8-3= 5-4= 5-1=
10-3= 10-2= 5-2= 7-3= 6-4= 8-4=