a1=1,a(n+1)=2an+3x5^n求an

远古时代的北京人的一天是怎样的? 我回到了远古时代 作文一篇作文,如上...不是《我回到了不会用火的时代》 证婚词英文怎么说?证婚人怎么翻 英语翻译Wives,submit to your husbands as to the Lord.For the husband is the head of the wife as Christ is the head of the church,his body,of which he is the Savior.Now as the church submits to Christ,so also wives should submit to their husbands 急求证婚词 怎样写证婚词 证婚词 内容 How time flies!There years___really a short time.A.is B.are C.was D.were.这题.大虾们出手!A,还说时间、金钱什么的是一个整体,谓语用单数.这个能懂字面意思,可咋运用呢?有没大虾们找几个具体一点的句子做 --How many___are there in your hometown?--More than ten.(A).shoe factory(B).shoe factories(C).shoe's factory(D).shoes factories 请问该选哪个? 改错：As time go on,there are more and more kinds of stamps. 以北京人的一天为题写一段50~100字的短文. 陪你一生 伴你一世 用英语怎么说 小红帽英语词语? 《风雨哈佛路》这部电影的英文简介故事简介啊,英文的,急用 —How long（）your home town?—For more than ten yearsA.have you been awayB.have you leftC.have you been away fromD.did you leave选哪个,请解释出来. It's over 2,000 years old and more than 4,500 miles long. --How long have you ___?-For more than 10 yearsA married B had married C got married D been married能说的更清楚点么 --How long____you_____(learn)English?--For more than two years. 去不同的俱乐部用英语怎么说 爱,是春风,抚着我们每个人的脸庞；爱,是阳光,照耀着我们每个人的心灵.仿写句子 罗斯福新政的内容及影响是什么 罗斯福新政的具体内容有哪些? 爱,是春风,抚着我们每个人的脸庞；爱,是阳光,照耀着我们每个人的心灵.仿写句子,给5个急 罗琳是现在畅销书之一―《哈利·波特》的作者.用英语怎莫说 英语翻译 I spend much more time playing basketball than I _______ for my lessons.为什么?I spend much more time playing basketball than I _______ for my lessons.A.spend to prepare B.do preparing C.do to prepare D.spend prepare 淮安中考 I spend much more time playing basketball than i ______ for my lessons.A.spend to prepare B.do preparing C.do to prepare D.spend prepare选什么? I spend much more time playing basketball than I____for my lessonsA.spend to prepare B.do preparing C.do to prepare D.spend prepare 跪求英语voa听力我需要和 教育技术 相关的英语VOA听力,最好是里面有很多和教育技术相关的词汇!我需要的是和教育技术有关的文章，可是我在VOA里没有发现和教育技术有关的，能再帮我找找 沪江英语VOA听力播放故障沪江英语VOA听力,打开这个听力网页并点击开始后,显示听写正在进行中,但是并没有任何音频的播放,既没音频的走动,更没声音,但我看好像没人遇到过这种情况,是我电 性爱英文怎么拼 我最近很喜欢《狼图腾》《藏骜》这样的,我看不进外国的书,真的.我只看中国的书,对心灵有穿透力的那种我最爱!