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a^n+2-6a^n+5a^n-2(n>2且n为整数
人气:236 ℃ 时间:2020-03-28 01:24:27
解答
a^n+2-6a^n+5a^n-2
=a^(n-2)[a^4-6a^2+5]
=a^(n-2)(a^2-1)(a^2-5)
=a^(n-2)(a-1)(a+1)(a^2-5)
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