3.5 用计算器探索规律(2).docxVIP

用计算器探索规律计算下面各题并发现规律1.99×98=999×998=9999×9998=99999×99998=2.6×9=66×99=666×999=6666×9999=答案提示1.97029970029997000299997000022.5465346653366653334