2.45乘以0.16乘以80怎么简便法?

2.45乘以0.16乘以80怎么简便法? 1.25乘以7乘以80.8怎么简便? 125乘以5乘以128乘以25怎么简便运算 9乘以72乘以125简便法 49乘以37+51乘以62+51乘以37+49乘以62怎么简便计算 五年级 0.15乘以0.8乘以12.5加8乘以3乘以0.125怎么简便算 33乘以3333加9999乘以8889的简便法怎么算 99乘以22加33乘以34怎么简便运算 99999乘以7778+33333乘以66666怎么简便 99乘以22加33乘以34怎么简便运算 25乘以64乘以125的简便算法怎么写 3.4乘以9+99乘以0.6怎么简便计算 0.25乘以3.2乘以1.25怎么用简便方法算? 230乘以54加上540乘以77简便怎么做 0.9乘以4.2乘以9.1用简便算法怎么算 45乘以[3乘以37]用简便方法怎么做 999乘以778+333乘以666怎么 简便 运算... 222乘以85加111乘以30怎么简便计算?