用竖式计算下面各题.8.4+1.52= 28.3﹣15.2= 46.9﹣24.8= 4.23+15.66=
10-6= 7-5= 9-2= 10-10= 9-9= 1-1=
4-2= 10-5= 4-3= 2-2= 2-1= 6-5=
6-3= 5-3= 6-6= 8-1= 9-1= 10-4=
8-4= 9-5= 5-5= 3-3= 7-7= 8-7=
9-4= 8-2= 9-7= 4-4= 10-5= 4-2=