问题 填空题

用简便方法计算4.2÷0.4÷0.25,应先算______,最后的商是______.

答案

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.

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