题目内容
用简便方法计算4.2÷0.4÷0.25,应先算
0.4×0.25
0.4×0.25
,最后的商是42
42
.分析:把4.2÷0.4÷0.25变成4.2÷(0.4×0.25)计算简便.
解答:解:4.2÷0.4÷0.25,
=4.2÷(0.4×0.25),
=4.2÷0.1,
=42.
故答案为:0.4×0.25,42.
=4.2÷(0.4×0.25),
=4.2÷0.1,
=42.
故答案为:0.4×0.25,42.
点评:此题考查简便方法的计算,根据一个数连续除以两个数等于这个数除以这两个数的积计算简便.
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