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3的64=(3^32-1)(3^32+1)=(3^16-1)(3^16+1)(3^32+1)=(3^8-1)(3^8+1)(3^16+1)(3^32+1)=(3^4-1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)=80×82×(3^8+1)(3^16+1)(3^32+1).這兩個數是80和82.(利用平方差公式)…
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