2004÷2004又2004/2005 把除数化成假分数
=2004÷[(2004×2005+2004)/2005]
=2004÷[2004×(2005+1)/2005]
=2004÷[(2004×2006)/2005]
=2004×[2005/(2004×2006)]
=2005/2006
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