0.8×0.5×0.4等于?用简便方法计算 0.8×0.5×0.4 =0.8X0.5X0.2X2 =(0.8X0.2)X(0.5X2) =0.16X1 =0.16 (这题主要运用了乘法交换律和结合律进行简便计算.)
