(2^2+1)(2^4+1)(2^8+1)×...×(2^32+1)=(2^-1)(2^2+1)(2^4+1)(2^8+1)×...×(2^32+1)×1/3=(2^4-1)(2^4+1)(2^8+1)×...×(2^32+1)×1/3=(2^8-1)(2^8+1)×...×(2^32+1)×1/3.......=(2^64-1)/3.方法用平方差公式:(a+1)(a-1)=a²-1,
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