∞∑ n=1 [(2n-1)/(3^n)]*[x^(2n-2)] ∞∑ n=1 [((-1)^n)/(2n-1)*(x^(2n)
问题描述:
∞∑ n=1 [(2n-1)/(3^n)]*[x^(2n-2)] ∞∑ n=1 [((-1)^n)/(2n-1)*(x^(2n)
答
=1 [((-1)^n)/(2n-1)*(x^(2n)/(3^n)]*[x^(2n-2)]