用简便算法计算下面各题. 5/18×4×9/18= (1/4+2/9)×3.6= 19×4/5=
问题描述:
用简便算法计算下面各题. 5/18×4×9/18= (1/4+2/9)×3.6= 19×4/5=
答
用简便算法计算下面各题. 5/18×4×9/18= (1/4+2/9)×3.6= 19×4/5=