(1-a )(1+a )(1+a^2)(1+a^4)(1+a^2n)(1-a )(1+a )(1+a^2)(1+a^4).(1+a^2n)(n为正整数)
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![(1-a )(1+a )(1+a^2)(1+a^4)(1+a^2n)(1-a )(1+a )(1+a^2)(1+a^4).(1+a^2n)(n为正整数)](/uploads/image/z/13385456-8-6.jpg?t=%EF%BC%881-a+%EF%BC%89%EF%BC%881%2Ba+%EF%BC%89%EF%BC%881%2Ba%5E2%EF%BC%89%EF%BC%881%2Ba%5E4%EF%BC%89%EF%BC%881%2Ba%5E2n%EF%BC%89%EF%BC%881-a+%EF%BC%89%EF%BC%881%2Ba+%EF%BC%89%EF%BC%881%2Ba%5E2%EF%BC%89%EF%BC%881%2Ba%5E4%EF%BC%89.%EF%BC%881%2Ba%5E2n%EF%BC%89%EF%BC%88n%E4%B8%BA%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89)
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(1-a )(1+a )(1+a^2)(1+a^4)(1+a^2n)(1-a )(1+a )(1+a^2)(1+a^4).(1+a^2n)(n为正整数)
(1-a )(1+a )(1+a^2)(1+a^4)(1+a^2n)
(1-a )(1+a )(1+a^2)(1+a^4).(1+a^2n)
(n为正整数)
(1-a )(1+a )(1+a^2)(1+a^4)(1+a^2n)(1-a )(1+a )(1+a^2)(1+a^4).(1+a^2n)(n为正整数)
(1-a )(1+a )=1-a^2
(1-a^2)(1+a^2)=1-a^4
以此类推,1-a^4n
什么意思