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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

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

1.Mike had taken her temperature（）the doctor came to see her A.because B.until C.before D.after2.Ann’s house is ten miles away from t 英语

e school and n

根据句意填空.Ann and Joan are( 1 ) .They look( 2 ) each other very much.People often ( 3 ) that Ann is Joan or Joan is Ann, ( 4 ) it's 英语

to tell the

1.__big success the film was!A.What B.What a C.How D.How a..还有原因.2.The man won an Oscar_Best Actor __his role in this 英语

ilm.A.as,in B.

已知数列{an}满足a1=1，且三阶行列式.1n30an+1n+10ann.＝2n2+2n，其中n∈N*，（1）求证：数列{ann}为等差数列；（2）求数列{an}的通项．其他

帮忙做英语,中一的annmeetsanoldclassmateattheshoppingcentre.Fillintheblankswiththecorrectobjectpronouns.Ray（简称R）：Hi,ann!Doyouremember(1)?Ann(简称英语

emember(1)____

句型转换。1.MylastnameisWhite.(对划线部分提问)lastname?2.HernameisAnn.(改为同义句)Ann.3.—Isthisyourquilt?(作否定回答)—,it 英语

—Is this your

都是关于初一英语的,2个选择,2个按用英语数字完成答案,2个连词成句.1个补充句子!非诚勿扰!()当你打听对方是否Ann时,你应该说：A.Hello,Ann.B.Hi,AnnC.You'reAnnD.Excuseme.AreyouAnn?()SheisKateGr 英语

he is Kate Gre

六年级英语连词成句.拜托了1.forward,I,am,you,looking,soon,see六年级英语连词成句.拜托了1.forward,I,am,you,looking,soon,seeing,to2.People'sPark,of,her,visited,fi 英语

irst,Ann,on,to

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