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平方差公式 原式=(3^2-1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)+1 =(3^4-1)(3^4+1)(3^8+1)(3^16+1)+1 =(3^8-1)(3^8+1)(3^16+1)+1 =(3^16-1)(3^16+1)+1 =3^32-1+1 =3^32
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