(2n+1)(4n二次方-1)(2n-1)

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(2n+1)(4n二次方-1)(2n-1)(2n+1)(4n二次方-1)(2n-1)(2n+1)(4n二次方-1)(2n-1)(2n+1)(2n-1)(4n二次方-1)[(2n)二次方-ab+ab-1

(2n+1)(4n二次方-1)(2n-1)
(2n+1)(4n二次方-1)(2n-1)

(2n+1)(4n二次方-1)(2n-1)
(2n+1)(2n-1) (4n二次方-1)
[(2n)二次方-ab+ab-1二次方] (4n二次方-1)
[(2n)二次方-1](4n二次方-1)
(4n二次方-1)(4n二次方-1)
16n四次方-1