求n∑1到n (-1)^n+1 [x^n+1/n(n+1)]的收敛域与和函数?

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求n∑1到n(-1)^n+1[x^n+1/n(n+1)]的收敛域与和函数?求n∑1到n(-1)^n+1[x^n+1/n(n+1)]的收敛域与和函数?求n∑1到n(-1)^n+1[x^n+1/n(n+1

求n∑1到n (-1)^n+1 [x^n+1/n(n+1)]的收敛域与和函数?
求n∑1到n (-1)^n+1 [x^n+1/n(n+1)]的收敛域与和函数?

求n∑1到n (-1)^n+1 [x^n+1/n(n+1)]的收敛域与和函数?
函数求两次导数,然后求和,