计算下面各题,能用简便方法的用简便方法(四年级上册小数的四则混合运算) (1)4.05÷0.81+2.4=5+2.4=7.4(2)0.389×4×0.25=0.389×(4×0.25)=0.389×1=0.389(3)0.35×7×2=0.35×2×7=0.7×7=4.9... 12/0421评论