(2n+3)^2-(2n+1)^2=4n^2+12n+9-4n^2-4n-1=8(n+1)
3^2-1^2=8=8x1 5^2-3^2=16=8x2论证
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3^2-1^2=8=8x1 5^2-3^2=16=8x2 7^2-5^2=24=8x3 9^2-7^2=32=8x4 …
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