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已知数列{an}满足a1=1，a2=3，且2nan=（n-1）an-1+（n+1）an+1（n≥2且n∈N*）则ann的最大值为（）A.1B.32C.119D.52 数学

已知数列{an}满足a1=1，且nan+1-（n+1）an=2n2+2n．（1）求a2，a3；（2）证明数列{ann}是等差数列，并求{an}的通项公式．数学

（2014•崇明县一模）已知数列{an}的前n项和为Sn，且a1＝12，an+1＝n+12nan．（1）证明数列{ann}是等比数列；（2）求通项an与前n项和Sn；（3）设bn＝n(2−Sn)，n∈N，若集合M＝{n|bn≥λ，n∈N}恰有4 其他

范围．

用所给词的适当形式填空.1 What ( ) your father ( ){do} now,Ann?He's reading a book.2 Please ( ){take} your ball away.3 Here is your eraser,Tom.( ) 英语

thank}very muc

将下列句子改为宾语从句.1."You can phone me from your office," he said to Ann.2."We've been here for two and a half years:' said the man,"and we'r 英语

going to stay

设{an}是a1=4的单调递增数列,且满足an+1^2+an^2+16=8（an+1+an）+2an+1an,求ann+1均为a的下标数学

完形填空,（可能有点多,Annis(1)Americanworker.Sheworks(2)abigfactoryinAmerica.It's(3)inthemorning.Ann(4)up.Sheissittingonthebed.Sheisputting(5)he 英语

is putting(5)h

高一数学题（等比数列篇）急!n^2（n≥4)个正数排成n行n列：其中每一行的数都成等差数列,每一列的数都成等比数列,且所有公比相等.已知a24=1,a42=1/8,a43=3/16,求ann. 数学

1.Excuseme.Howdoyouyourfirstname?ANN,AnnAsayBspellCspeakDtalk2isagirl'sname.ALindaBBenCTonyDTim3What'syourfirstname?It'sABrownBAmyCAmy 英语

st name?It's_A

英语填空1.putinam,is,are.I()nottired.Look!There()CarolThisbag()heavy.mybrotherandI()goodtennisplayers.Thesebags()heavy.Ann()athome.Herchil 英语

Ann( )at home.

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