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6÷________=数学公式=0.4=________÷20=________%

15    8    40
分析:解答此题的关键是0.4,把小数点向右移动两位,写成百分数是40%;写成分数是:=;写成除法算式是2÷5=6÷15=8÷20;据此即可填空.
解答:6÷15==8÷20=40%.
故答案为:15;45;8;40.
点评:此题考查小数、分数、百分数、比和除法之间的转化,根据它们之间的关系和性质进行转化.
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