5.46/9.1=0.6验算:9.1×0.6=5.46
5.46/9.1计算和验算 0.691)▔▔▔▔▔▔▔▔▔▔▔▔54.6- 54.6▔▔▔▔▔▔▔▔▔▔▔▔0验算:0.6x9.1= 5.46 0.6x 9.1▔▔▔▔▔0 654 ▔▔▔▔▔▔▔ 546 ----------- 向左移动2位小数点de 5.46 .