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∵n^4+1/4
=(n^4+n^2+1/4)-n^2=(n^2+1/2)^2-n^2=(n^2+n+1/2)(n^2-n+1/2),
于是:
1^4+1/4=(5/2)·(1/2),
2^4+1/4=(2^2+2+1/2)(2^2-2+1/2)=(13/2)·(5/2),
3^4+1/4=(3^2+3+1/2)(3^2-3+1/2)=(25/2)·(13/2),
4^4+1/4=(4^2+4+1/2)(4^2-4+1/2)=(41/2)·(25/2),
5^4+1/4=(5^2+5+1/2)(5^2-5+1/2)=(61/2)·(41/2),
6^4+1/4=(6^2+6+1/2)(6^2-6+1/2)=(85/2)·(61/2),
7^4+1/4=(7^2+7+1/2)(7^2-7+1/2)=(113/2)·(85/2),
8^4+1/4=(8^2+8+1/2)(8^2-8+1/2)=(145/2)·(113/2),
得:
(1^4+1/4)/(2^4+1/4)=1/13,
(3^4+1/4)/(4^4+1/4)=13/41,
(5^4+1/4)/(6^4+1/4)=41/85,
(7^4+1/4)/(8^4+1/4)=85/145,
进而得:原式=1/145。
=(n^4+n^2+1/4)-n^2=(n^2+1/2)^2-n^2=(n^2+n+1/2)(n^2-n+1/2),
于是:
1^4+1/4=(5/2)·(1/2),
2^4+1/4=(2^2+2+1/2)(2^2-2+1/2)=(13/2)·(5/2),
3^4+1/4=(3^2+3+1/2)(3^2-3+1/2)=(25/2)·(13/2),
4^4+1/4=(4^2+4+1/2)(4^2-4+1/2)=(41/2)·(25/2),
5^4+1/4=(5^2+5+1/2)(5^2-5+1/2)=(61/2)·(41/2),
6^4+1/4=(6^2+6+1/2)(6^2-6+1/2)=(85/2)·(61/2),
7^4+1/4=(7^2+7+1/2)(7^2-7+1/2)=(113/2)·(85/2),
8^4+1/4=(8^2+8+1/2)(8^2-8+1/2)=(145/2)·(113/2),
得:
(1^4+1/4)/(2^4+1/4)=1/13,
(3^4+1/4)/(4^4+1/4)=13/41,
(5^4+1/4)/(6^4+1/4)=41/85,
(7^4+1/4)/(8^4+1/4)=85/145,
进而得:原式=1/145。
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