all+but+one+take+part+in

@却关1294:all的用法 -
鞠咱18512395764…… 1. 与定冠词、指示代词、形容词性物主代词、名词所有格等限定词连用时,all 应放在这些词之前 (而不是之后),并且一般可在它们之间加介词 of (也可省略).如:all (of) the people 所有这些人 all (of) her children 她所有的孩子 all (of) these ...

@却关1294:英语to的用法 -
鞠咱18512395764…… to的用法 一:表示相对,针对 be strange to 二:表示对比,比较 1:以-ior结尾的形容词,后接介词to表示比较 senior,junior 2: 一些本身就含有比较或比拟意思的形容词 A is similar to B in many ways. 3:表示一些先后顺序的形容词 they returned...

@却关1294:Charles Schillings的《Stand By》 歌词 -
鞠咱18512395764…… 歌曲名:Stand By歌手:Charles Schillings专辑:Not CorrectMy teas gone cold Im wondering why I..got out of bed at allThe morning rain clouds up my window..and I cant s...

@却关1294:it's time to 和It's time for的区别 -
鞠咱18512395764…… 一、后接词不同. 1、it's time to后面接动词原形. 2、it's time for后面一般接某人(某部门或机构)+to do sth, 也可以直接加sth. 二、强调的意思不同 1、it is time for强调的是:是时候做某事了,重在事情,后面要跟名词(n.)或者动名词(...

@却关1294:英语写作常见句型有什么结构吗? -
鞠咱18512395764…… 开头: When it comes to ..., some think ... There is a public debate today that ... A is a commen way of ..., but is it a wise one? Recentaly the problem has been brought into focus. 提出观点: Now there is a growing awareness that... It is time we ...

@却关1294:数列问题急!已知数列an的首项为,前n项和Sn,且有S(n+1)=tSn+a,求数列通项公式 -
鞠咱18512395764…… 方法1:S(n+1)=tSn+a 设S(n+1)-x=t(Sn-x) S(n+1)=tSn-xt+x-xt+x=a x=a/(1-t) S(n+1)-a/(1-t)=t[Sn-a/(1-t)] 所以Sn-a/(1-t)是公比为t,首项为S1-a/(1-t)=a1-a/(1-t)=a-a/(1-t)=-at/(1-t)的等比数列,Sn-a/(1-t)=-[at/(1-t)]t^(n-1) Sn=a/(1-t)-[at/(1-t)]t^(n-1) S(n-1)=a/(...

@却关1294:已知向量a=(2,1)与向量b=(1,2),要使|a+tb|的值最小,求t值 -
鞠咱18512395764…… |a+tb|²=a²+2tab+t²b² =5+8t+5t² =5(t+4/5)²+9/5 当t=-4/5时|a+tb|²的最小值为9/5 故当t=-4/5时|a+tb|的最小值为3√5/5

@却关1294:_____ - are those that cannot be used independently but hav... - 上学吧
鞠咱18512395764…… a(n+1)=pa(n)+qa(n-1),则a(n+1)+t(an)=(p+t)an+qa(n-1) a(n+1)+t(an)=(p+t)[an+q/p+t *a(n-1)] 当t=q/p+t,即t²+pt-q=0时,a(n+1)+t(an)是等比数列

@却关1294:已知两个单位向量a.b的夹角是60°,c=ta+(1 - t)b,bc=0,t=? -
鞠咱18512395764…… b·c=tab+(1-t)b=t*1*1*cos60°+1-t=1/2t+1-t=-1/2t+1=0 1/2t=1,t=2

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