求(-1)^(2n+1)+(-1)^2n+(-1)^(2n-1)的值.(n是正整数)急!
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求(-1)^(2n+1)+(-1)^2n+(-1)^(2n-1)的值.(n是正整数)急!
求(-1)^(2n+1)+(-1)^2n+(-1)^(2n-1)的值.(n是正整数)
急!
求(-1)^(2n+1)+(-1)^2n+(-1)^(2n-1)的值.(n是正整数)急!
=-1+1-1=-1