限定24小时第二部

已知数列{an},a1=3,a2=6,且a(n+2)=a(n+1)-an,则数列的第五项为? 都说网络是虚幻的,为什么啊,网络有生命吗? 一个数列{an},其中a1=3,a2=6,a（n+2）=a(n-1)-a(n),那么这个数列的第五项是什么 A 6 B -3 C -12 D -6 hear from;lead to;so far;be guilty of;put up;charge...with 用正确的形式填空(会追加分的）1.Mr Brown_____________a good fight with thief.They struggled for one or two minutes.Mr Brown got hurt________________.The thief was frightened and 英语速成班有吗?想要短期提高英语,过一段时间要评级升职,想找个英语速成班快速提高英语水平,谁能给我一些建议呢? charge me 新东方的暑假中外口语速成班怎么样 charge it to me 同题 > 海丰话速成班求解 Please don’t ask any up charge to the buyers.这里的UP CHARGE是啥意思 会计速成班哪里好? charge.with.有委托之意吗?我知道charge with 是控告之意,那分开是什么?very thanks 网络是否有益?正方材料（精炼）让反方无言以对,好的加 网络是否有益辩论稿【反方】 已知数列｛an｝中,a1=3,a2=6,an+2-an-1-an,则数列的第五项为 山穷水尽疑无路 bec商务英语口语实战班哪里好? 山穷水尽疑无路的上一句是什么啊? 求商务英语口语攻略 Turn right at the third _____ (cross). Turn left at the third c__________. He studies laws very hard because he wants to be a l__ in the future Dick studies hard.Hw wants to pass the examination 合并为简单句 He wants to pass the English exam,so he works hard ____ it.A.for B.as C.at D.with 求peppermoon的bed and breakfast的歌词中文翻译,急~ 1).若等差数列an的前五项和S5=25,且a2=3,则a1=? (要过程)急 等比数列{an}中,已知a2-a1=4,a5-a4=108,则前5项和S5=多少? 用英语怎么写温馨 “使……温暖”的英文谁能温暖我..的英文 山穷水尽疑无路. 山穷水尽疑无路,柳暗花明又一村,代表什么意思? we covered the hole with the earth变被态 1who will look after the children 变成被态 By whom ..2where did you find your pencil .where...3i saw her read a story book 4 the story made us story 5 they have painted their new house 6people keep shee