用简便方法计算下面各题。43.6+9.8+6.4 17.3× 0.25× 8 2.31×1.5+1.5×7.69 0.65×201
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=