34.5*8.23-34.5+0.277*345简算

34.5*8.23-34.5+27.7*3.45简便算法 34.5*76.5-345*6.42-123*1.45 用运算律简算 34.5乘8.23减34.5加27.7乘3.45 简便计算． 15.6789÷20÷5 2.8×23.4+11.1×57.6+6.54×28 34.5×8.23-34.5 34.5×76.5×－345×6.42－123×1.45 要简算 34.5*76.5-123*1.45-345*6.42如何简算? 34.5×76.5-345×6.42-123×1.45（简便算法） 34.5乘76.5-345乘6.42-123乘1.45 34.5×9.23-34.5+1.77×34.5． 34.5乘76.5减345乘6.42减123乘1045简便方法 计算123+234+345+456+567+678+789/12.3+23.4+34.5+45.6+56.7+67.8+ 34.5*76.5-345*6.42-123*1.45用简便方法怎算