lisa+ann+tube+mom
答：kg (kilogram), TV (television), cf (confer), cm (centimetre)AD,A.DAnno Domini(=in the year of th英文缩写e Lord;since Christ was born 公元 A.M.,a.m.ante meridiem(before noon) 上午，午前 Apr. April 四月 Aug.August 八月 Ave.avenue 林荫道，大街 BABachelor of Arts 文科学士...
答：San Francisco--Scott McKenzie Seule--Keren Ann Stephanie Says-Keren Ann & Bardi Johannson Sha La La-Dreamhouse Sunny Come Home-Shawn Colvin T'en va pas--Elsa Thank You--Dido The Best Mistake I’ve Ever Made-王若琳 The Little Things-Colbie Caillat Ti amo--Umberto Tozzi True Colours-OLIVIA...
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扈维17341149993：
等差数列有如下性质,若数列{an}是等差数列,则当bn=a1+a2+…+ann(n∈N*)时,数列{bn}也是等差数列;类比上述性质,相应地{cn}是正项等比数列,当数... -
10457薄单
：[答案] 由数列{an}是等差数列,则当bn= a1+a2+…+an n(n∈N*)时,数列{bn}也是等差数列. 类比得到:{cn}是正项等比数列,当数列dn=(c1c2…cn) 1 n时,数列{dn}也是等比数列. 证明如下: ∵{cn}是正项等比数列,设其公比为q, ∴(c1c2…cn) 1 n=(c1nq1+...
扈维17341149993：
根据下列条件,写出数列的前四项,并归纳猜想它的通项公式:①a1=1,an+1=an+ann+1(n∈N*)②a1= - 1,an+1=an+1n(n+1)(n∈N*) -
10457薄单
：[答案] ①∵a1=1,an+1=an+ an n+1, ∴a2=a1+ a1 1+1= 3 2,∴a3=a2+ a2 2+1=2, 同理可得a4= 5 2,猜想an= n+1 2; ②∵a1=-1,an+1=an+ 1 n(n+1), ∴a2=a1+ 1 1*2=- 1 2,∴a3=a2+ 1 2*3=- 1 3, 同理可得a4=- 1 4,猜想an=- 1 n
扈维17341149993：
已知数列{an}满足a1=1,nan+1=(n+1)an+in(n+1)(i为常数)(1)证明:{ann}是等差数列;(2)若{an}是正数组成d数列,试给出不依赖于nd一个充分必要条件,... -
10457薄单
：[答案] (1)∵nan+1=(n+1)an+cn(n+1)∴an+1n+1=ann+c,即 an+1n+1−ann=c从而数列{ ann}是首项为1,公差为c的等差数列(x)由(1)可人 ann=1+(n-1)c,即an=cnx+(1-c)n{an}是等差数列的充要条件是an=an+b...
扈维17341149993：
线性代数的证明题设n阶矩阵A=(aij)的特征值为 λ1, λ2, …… λn,证明:(1)λ1 +λ2 +……+λn=a11+a22+……+ann;(2)λ1 •λ2 •…•λn=|A|.没有,书上没有... -
10457薄单
：[答案] 特征方程|λEn-A|=0的根为λ1, λ2, … λn 则|λEn-A|=(λ-λ1)(λ-λ2)…(λ-λn)=λ^n-(∑λi)λ^(n-1)+…+(-1)^n(∏λi) 取λ=0,即得|-A|=(-1)^n(∏λi) 因而|A|=∏λi,即λ1 •λ2 •…•λn=|A| 再根据行列式定义可得, |λEn-A|=(λ-a11)(λ-a22)…(λ-ann)+{(n!-1)个不含λ^n...
扈维17341149993：
<stay >lisa loeb的中文歌词~ -
10457薄单
： lisa loeb的中文歌词~Stay=Lisa Loeb=You say I only hear what I want to.你说 我只听我想听的You say I talk so all the time so.你说...
扈维17341149993：
C语言课程设计 - 学生成绩管理程序 -
10457薄单
： #include /*引用库函数*/ #include #include #include typedef struct /*定义结构体数组*/ { char...
扈维17341149993：
2.Liz ( ) at 6:50 am.She likes wearing white T - shirts.1.Ann ( ) at school at 12:30.3.Lisa ( ) lat on weekends.she has it at 9:00.4.Brad ( ) really early in the morning.... -
10457薄单
：[答案] 2、Liz (gets dressed,穿衣) at 6:50 am.She likes wearing white T-shirts. 1、Ann (has lunch,吃午餐) at school at 12:30. 3、Lisa (gets up,起床) late on weekends.She has it at 9:00. 4、Brad (gets up,起床) really early in the morning. 5、Robert (...
