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3×(-3)^2n+(-3)^2n+1 算出来
人气:167 ℃ 时间:2020-06-11 17:43:20
解答
3×(-3)^2n+(-3)^2n+1
=3×3^2n-3^(2n+1)
=3^(2n+1)-3^(2n+1)
=0
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