摘要: 求 $$ \prod_{\oplus a_i = 0}b_i $$ 阅读全文
posted @ 2020-07-30 14:49 Hs-black 阅读(134) 评论(0) 推荐(0) 编辑
摘要: $$ F = x \exp(F+\frac 12\sum_{n\ge2}F^i)\\ = x \exp(F+\frac {F^2}{2-2F})\\ = x \exp(\frac {2F-F^2}{2-2F}) $$ 阅读全文
posted @ 2020-07-30 11:15 Hs-black 阅读(380) 评论(0) 推荐(0) 编辑