列竖式计算.9.2﹣6.9= 28×71= 963÷8=7.7+2.8= 636÷6= 56×39=.
8-2= 6+2= 8-6=
6-3= 3+3= 7-5= 5+2=
9-4= 9-5= 4+5=
10-4= 10-6= 4+6=
5+2= 7-5= 7-2=