x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式

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x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式x,-2x^2,3x^3,-4x^4.-100x^100

x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式
x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式

x,-2x^2,3x^3,-4x^4.-100x^100写出第n个单项式
(-1)^(n+1)*nx^n

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