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Really very vexed person!Ah!Myself a personal really boring,does don"t know when then can see an own real girl?Do you think,I don"t sm 英语

ke cigarette,d

在数列an中a1=1a（n+1）=2an+2^n设bn=an/（2^n-1）.1.证明：数列bn是等差数列2.设数列an的前n项和为Sn求limSn/(n*2^（n+1))3.设cn=2bn-1数列cn的前n项和为Tndn=Tn/（（4an）^2-Tn）是否存在实数t 数学

实数t使得对任意正整数n和实

Actually as an AI,I don"t really have a mother. 英语

A.less than B.more than C.more D.less 2.there is a _.It_,you can"t teach an old dog new tricA.less than B.more than C.more D.l 英语

ss2.there is a

Marry didn"t fly to America the night after next Marry did not fly to America the night after nextMarry didn"t fly to America the nigh 英语

after nextMar

This Is for u:) Read till the end it"s adorable!I sent an angel to watch over you last night,but it came back and I asked,"why?"...The 英语

angel said,"an

在等差数列an中,有下述结论:若a1+a2+……+a50=s,a(n-49)+a(n-48)+……+an=t其中n在等差数列an中,有下述结论：若a1+a2+……+a50=s,a(n-49)+a(n-48)+……+an=t其中n>49属于非零自然数.则a1+a2+…… 数学

……+an=(n/100)*

在等差数列{an}中，a1=1，a5=9．（1）求a3；（2）记bn=2an，证明：数列{bn}是等比数列；（3）对于（2）中的Sn，求函数f（n）=Sn-t•2n（n∈N*，t为常数且t∈[0，8]）的最小值g（t）．其他

在等差数列{an}中,若s,t∈N※,有(as-at)/(s-t)=常数若s.t,r∈N※,且s,t,r互不相等,有（s-t）ar+(t-r)as+(r-s)at=0；则在等比数列{bn}（bn＞0）中相应有数学

英语翻译A:Hi,Tony.I'm starting a band.will you join us?B:Sure,Ben.I'd love to be in a band A:OK,good.which instrument will you play?B:I do 其他

't play an ins

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