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
看谁算得又快又准。10-6= 10-9= 9-8=6-5= 6+4= 5+4=
看谁算得又快又准。9-2= 6+2= 5+3=5+2= 3+7= 10-10=
6-3= 6+3= 7-6=8-8= 9-8= 10-8=
看谁算得又快又准。8-4= 8+1= 9-2= 4+5= 3+6= 6-1=
看看谁算得准。9-4= 9+1= 9-6=8+1= 7+2= 8-7=