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25÷________=1数学公式=________:12;     
5.32升=________立方分米;
3小时15分钟=________小时.

15    20    5.32    3.25
分析:(1)解答此题的关键是1,化成假分数是,根据分数与除法的关系,=5÷3,再根据商不变的性质,被除数发、除数都乘5就是25÷15;根据比与分数的关系,=5:3,再根据比的基本性质,比的前、后项都乘4就是20:12.
(2)由于升与立方分米是等量关系,升化立方分米,数值不变.
(3)由复名数化单位名数,把15分除以进率60化成0.25小时,再与3小时相加.
解答:(1)25÷15=1=20:12;
(2)5.32升=5.32立方分米;
(3)3小时15分=3.25小时.
故答案为:15,20,5.32,3.25.
点评:(1)此题主要是考查除式、分数、比之间的关系及转化,利用它们之间的关系和性质进行转化即可;(2)、(3)是考查单位的换算,要注意单位间的进率.
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