用竖式计算,带*的要验算.(1)450×6=(2)78×9=(3)308×7=(4)*951÷3=(5)*856÷7=
km的一半是多少千米?
= = == = =
= 12×= = =×24= ×= ×= ×=
列式计算.(1)米的是多少米?(2)吨的是多少吨?
计算下面各题,再观察每组题目和结果,你有什么发现?