54.9×0.46的简便方式 - 百度知道 最佳答案: 54.9×0.46 =54.9×(0.5-0.04) =54.9×0.5-54.9×0.04 =(55-0.1)×0.5-(55-0.1)×0.04 =55×0.5-0.1×0.5...