(−1)nn!xn\frac{(-1)^{n} n !}{x^{n}}xn(−1)nn!
(−1)n−1(n−1)!xn\frac{(-1)^{n-1}(n-1) !}{x^{n}}xn(−1)n−1(n−1)!
(−1)nn!xn+1\frac{(-1)^{n} n !}{x^{n+1}}xn+1(−1)nn!
(−1)n(n+1)!xn+1\frac{(-1)^{n}(n+1) !}{x^{n+1}}xn+1(−1)n(n+1)!
