已知数列an的前n项和为sn，且满足sn=ann2-1，求an的通项公式

to see,and,I,to,his,house,it,went 在打雷闪电的时候为什么不能站在树下 打雷闪电为什么不能在树下躲避以及应注意的事项 would rather sb.后面 除了加did sth.还有其他吗? would rather sb.did sth造句2个 would rather sb did怎么用? 英语翻译秒5的主题曲 my uncle ___to see us tomorrow and i am going to meet him at the airport.为什么答案是is coming.is about to come 不行吗is about to 不是将要的意思吗 I'm going to___hospital to see my uncle.He is ill in____A./,the B.don't C.needn't D.wouldn't Sorry oh baby can't you say.What can you do for me.You no what you miss to me sorry.I can only say 打雷时不能做什么事? 打雷不能做什么事情?打雷不能干什么? 打雷的时候最好不要做什么事?雷打得电视都自动关了··怎么搞的 打雷时不能干什么 who would you rather have _____the comuter,Jimmy Who would you rather_with you,George or me A.going B.to go C.have gone D.wentC和D选哪个,请解释理由,我也选的B， Who would you rather ----- the report for youA.have to B.have written C.have writing D.have write who would you rather () there with you?A:have to go B:to go C:went D:go 为什么呢?a为什么不行? [急]生物:牡丹叶肉细胞中核酸所含碱基种类有几种? 称赞月亮在空中怎么样美好的句子谁有?月亮在空中怎么样美好的句子谁有?不要诗歌的!好的肯定给5星 明天将要离开这里的男孩 the boy leaving here tomorrow the boy who will leave here tomorrow 将要离开这里的男孩 the boy leaving here the boy who will leave here -would you help me clean the windows.-_.i'would rather wipe the floor.a,nothing but thatb,don't mention itc,anyning but that d,with pleasure Would you like me to help you（）the classroom?（用clean的适当形式） 英语翻译翻译英语 before the class (),would you please help me clean our classroom.填begins还是beginning详细 love comes again中文什么意思 again from the 原句"What really happened during that accident?"another person askde,again from the back.、还有、renownde for their general in competence是怎么翻译?这个是说一个大公司的、第一句话里的accident上文已经有 Look at his head,his h___ is black. He has a small face 同义句 His face is small 改为一般疑问句His face is small 改为一般疑问句 Jake has a small m____.