数列an中，sn=2an-1,数列bn满足b1=1,bn 1=bn an 1.证明an为等比数列

the sweater is made of wool.it feels very s________ My sweater is made ____wool while your overcoat is made____animal fur.选填Of,from.并说明一下理由, 1,there is a hotel ( )the bank.A,near to B,next C,next to next at2,（ ）weekdays we go to school（ ）7.A,at,in B,in,at C,for,about D,on,at3,on（ ）way to the park ,i met my english teacher.A,het B,his C,my D,this4,give me three （ ）,pleasa.A 四六级证书怎样鉴别真假 有了四六级证书?工作?是不是在大学里那四六级证书都拿到?出来找工作就比较好找? 现在四六级过后有没有证书?学校只给一张成绩单 人上了太空,不穿太空衣会怎样? 如果人不穿太空衣直接暴露在宇宙中会爆么?复制勿扰 四六级证书,怎么补办?四六级的证书,找不到了……怎么才能补办?或者是开具有效证明?急用,谢谢!看到了,补办的时间有点长,现在也来不及了~不知道最快捷的方式是什么?只要证明出来就可以~ 关于红豆的诗词有那些 有关红豆代表相思的古诗或诗歌啊 It is (june 1).对括号内提问 描写红豆的诗句有哪些? 翻译一句英文!急!【百度翻译是错的.】I always scored a high mark when we practiced telling someone that their family member had died. They should do it at once.改成被动句. We should do it at once.改为同义句We _______ _______ _______ do it at once.这样怎么改？ 百度里英语在线翻译会错吗 The _______day of June is Children's day. Would you like to come?回答：Sorry,I am very ＿ . Is it your T-shirt?(否定回答） Is that your T-shirt?No,it is{ }A、Mike B、hin C、Mike is 英语课前准备的ppt!内容有趣丰富点儿的.发到我邮箱.chi320@126.com those who were not fit for their work could not see the beautiful clothes made of the magic cloth求翻译 they use old clothes to make cloth bags .这句话有错吗? .they use old clothes to make cloth bags .这句话有错吗?原因. 中国领土是印度的几倍 英语歌曲 翻译 一篇关于我和我的朋友的英语作文,中文200~300字 关于旅行的一篇英语作文 200-300字写曾经到哪里旅行过的,有什么风景,和谁,有趣的事情……（请带上中文翻译）英语水平： 把are they models going when to make 连词成句 造词连句：1.are they models going when to make 2.is next Jenny what going to do month How often does the Olympic Games____?A take out B take care of C take off D take place.