用简便方法计算:25×125×40×857×38+57×2(20+8)×125(163+198)+40237×10144×25.
用竖式计算.2.97×3.8= 7.05×0.84= 0.78×4.3= 1.8×3.67=
口算小博士.0.1×0.02= 3.5+7.6= 12﹣6.2﹣3.8= 0.6×1.01=1.5×0.4= 1.7+0.43+3.3= 500×0.001= 2.56﹣0.37=5.4﹣2.5﹣1.4= 2.4×2.5= 4.9÷10= 7.5×2.5×4=
竖式计算下面各题.0.46×3.50.86×1.4(得数保留两位小数)3.6×2.160.54×1.35(得数精确到十分位)
用竖式计算.4.6×6= 8.9×7= 15.6×13=0.18×15= 0.025×14= 3.06×36=
用竖式计算下面各题.9.21×3.8= 5.8×2.5= 0.31×0.99=7.05×0.84= 40.9×8.7= 0.O8×2.4=