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数列﹛an﹜为等比数列,a1＋a2＝9,a1a2a3＝27,前n项和为Sn.求limSn I like sugar,but I am toothache 麻烦帮我翻译下 已知等比数列（an）中,a1+a2=9,a1a2a3=27,sn=?详细谢谢, 已知等比数列﹛an﹜中,a1＋a2＝9,a1·a2·a3＝27,则﹛an﹜的前n项和Sn＝? what's the happening 意思：怎么了,正发生什么事．但为什么加　＂THE＂?THE　干什么用? 国庆中秋小长假快到了,打算趁这个假期给孩子补一补英语和数学,邹城哪个辅导机构最好? 翻译口语“I'm breaking out in a cold sweet!” You are too cold for me,just as ice cream .like,however,sweet ice One is my oider brother and the other one is young than me哪里错了 音标/wiŋz/是什么单词?求 谁有关于"天勇星 大刀 关胜"的点评 谁和我一样喜欢大刀关胜,原因? 关于“大刀关胜”?据说关胜是关羽的后裔 大家应该肯定吧?那问题就出来了 三国庞德之子庞会说是将关羽的家人灭族了?那请问这样一来哪来的关胜? tell sb a tell sb.message是什么意思 雅思写作比较薄弱,不知海珠区新东方雅思什么班针对于英语写作教学的? 英语达人请进（请解释这个句子中的重要语法点）Therefore they would have been more likely, had they not switched courses,to cease attending lectures than those who did not switch. 怎么判断 《古文观止》《史记》《聊斋志异》哪一本更适合高三学生细读提高文言文的阅读能力呢?求推荐比较好的全国获奖美文阅读,书籍或者是刊物名. every的音标 /ri'si:v/这个音标怎么读?谁知道阿!求求你了!小女子没钱, 这两个数的和是几 中的几是什么词性它为什么是代词 两个词性转换That factory is ______(bad) affecting and damaging the river next.The atmosphere is keeping in too much ______(hot) 古文观止 孩子几年级看合适? 空有什么词性,可以作副词么? 新媒体时代如何解析受众 【你】的同义词 a computer with five thousand books ——to the children in poor areas as a present.A are given B is given Chave been given【请帮忙解释为什么其他两项不行.】 A library with five thousand books _____ to the nation as a gift.a:is offeredb;has offered 答案是a,要是b改为has been offered可以不? A library with five thousand books_____to the nation as a gift A：is effered B:has efferedD:are effered C:have effered 这道题为什么不能选B啊 A library with five thousand books_____to the nation as gifeA is offeredB has been offeredC are offeredD have been offerdr为什么不选A 请问新东方的"拓展词汇5000"怎么样?我是成都的有上过这个班的人吗?效果如何?有必要报吗?我词汇量很少大概顶多只有1000多,不知上这个班能跟上吗?因为只有5000和8000两种班...PS:我现在"新概念