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2005乗2007 平方差を使う =(2006-1)(2006+1) =2006²-1 だから元のスタイル=2006²-2006²+1 =1
2006²/(2005*2007+1) =2006²/((2006-1)*(2006+1)+1) =2006²/(2006²-1+1) =2006²/2006² =1
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