用竖式计算. ①1.57÷3.9 (精确到十分位) ②3.42×0.25 ③14.2÷11(商用循环小数表示)
计算下面各题.= = = ﹣= 1﹣=﹣= = ﹣= =
看谁算得又对又快.= = == = =.
3与4的倒数之差是多少?
算一算.+= ﹣= +=+= ﹣= ﹣=
+= 1﹣= += +=1﹣= += ﹣= ﹣=