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9—1=8*1 =3^2-1^2 25—9=8*2 =5^2-3^2 49—25=8*3 =7^2-5^2 81—49=8*4,=9^2-7^2 所以都是相鄰奇數的平方差,結果是8的倍數 所以(2n+1)^2-(2n-1)^2=8n
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