已知数列an的前n项和为sn，且满足sn=an+n2–1

英语笔译三级 与 CET4 哪个含金量更高呢最近闲极无聊想考个英语证书,不知道英语笔译的等级和CET哪个含金量高呢 核磁共振氢谱和质谱法哪个能得出碳氢比? thank you very much 是祈使句么后面可能有for 之类的 go的将来时 是不是 going 过去式是什么 关于there is one thing better than ……完形填空的答案 i m going to go to America什么意思 Im going to go to America__________. buy是什么 buy的现在分词为什么不是buyying?请说明理由. purchase和buy有什么区别?要例句 我想问一下09年人事局的英语三级笔译报名时间是什么时候啊 谢谢!急用! 成都英语三级笔译在哪报名 时间是? 英语翻译潍坊港报 翻译成英语 是 weifang port paper 就是做报纸,要它的英语翻译! 英语翻译的工资在潍坊是多少?工作好找吗? 潍坊天天假日酒店英语怎么翻译 潍坊大海运输有限公司谁能帮我翻译成英文 Did he use to get up early?= Used he to get up early?请问这俩句成立吗? 一句话翻译That life,if there is anything in heredity,is very far from finished; if there's nobody ever came to my life from the start如果一开始就没有人走进我的生命不对的话修改一下 There was a very spcial who made a far reaching difference in my life 英语翻译语言翻译 beam me up中文歌词 Beam me My healthy lifestyle helps me get good g_______. My. Healthy.lifestyle. helps. me. get. good. giades.对 My. Healthy.lifestyle. 提问 beast fiction 讲的什么故事beast 的fiction讲的是一个怎样的故事 BEAST的Fiction的MV讲的是什么意思? They spent nine months before they were born 其中were后为什么加born,而不是borning或borned Beam homogenizer翻译, Nick and kitty were born on the fifth of April,1998.They are 12 now.翻译成中文 英语翻译帮忙翻译下sheave beam是什么意思？ 英语翻译如题