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翕加欠怎么读 设n元二次型f=X^TAX,A的特征值λ1 正交矩阵的一个证明题a是n维实列向量,a不等于0,矩阵A=E-kaaT,k为非零常数,则A为正交矩阵的充分必要条件为k=?求详细思路. 证明正交矩阵已知E是单位矩阵,u是单位列向量,证明：E-2uu'为正交矩阵. "焚"用部首查字法查字典应查什么部,在查多少画,读音是什么,意思是什么. 苏轼一生写了多少首诗. 已知α1=1/√3*(1,1,1)^T,试求向量α2,α3,使得α1,α2,α3是三维空间R^3上的一组标准正交基 仁爱英语的基础训练在哪买 初二仁爱的英语练习哪本好我英语属于上等偏下. 仁爱英语七年级下册基础训练答案(74页到78页)速度点 《送友人》挥手自兹去“兹”字读音如题 sec^2 x是f(x)的一个原函数,则∫xf'(x)dx=? 设三元向量a与β正交且都是单位列向量,A=aa^T-ββ^T证明1,-1是A的特征值.r（A）=2. 求高人证明：正交阵的列向量都是单位向量,且两两正交. 尽量详细 给高分 “我们是吃饭长大的,也是读书长大的.”的理解除了“吃饭长大”指的是身体的物质需求,“读书长大”则是指精神的成长,心灵的成长 .粮食哺育的是人的身体,而书籍哺育的是灵魂,一个知识 设α1,α2为n维向量组,β1=2α1+3α2,β2=3α1+α2,β3=4α1-3α2,则向量组β1,β2,β3一定线性相关 They were all so tired that they could ____.nothing but sleep .我想知道but不是介词吗?为什么but后不用sleeping? When the fire broke out,many people were so____frightened__ that they ran _________.wild and wildlWhen the fire broke out,many people were so______ that they ran _________.A.frightening; wild B.frightened; wildC.frightened; wildly D.frightening; wild They were so handsome that I couldn't do it语法错误? 加工一批零件,甲、乙合做15天完成,现在由甲先做10天,然后乙再做12天,还剩下这批零件的1/4没完成,已知甲每天比乙少加工5个零件,求有多少个零件在线等啊 线性代数行列式求值 文天祥丹心照汗青【宋书】的翻译 少年中国说 梁启超 翻译 英语翻译天祥至朝阳,见弘范,左右命之拜,不拜,弘范遂以客礼见之,与俱入山崖,使为书招张世杰.天祥曰：“吾不能捍父母,乃教人叛父母,可乎?”索之固,乃书所作《过零丁洋》诗与之.其末有云 英语翻译第一个+分是宋书 英语翻译天祥至潮阳,见弘范,左右命之拜,不拜,弘范遂以客见之,与俱入崖山,使为书招张世杰.天祥曰:"吾不能捍父母,乃教人叛父母,可乎?"索之固,乃书所作《过零丁洋》诗与之.其末有云:"人生 英语翻译今天就要， 一批零件,甲单独做了3天完成,乙单独做4天完工,现在赶工期,甲乙合作,完工时,甲比乙多做了24个,这批零件有多少个? 有一批零件,甲,乙两种车床都可以加工.如果甲车床单独加工,可以比乙车床单独提前10天完成任务.现在用甲,乙两车窗一起加工结果12天就完成了任务.如果只用甲车床单独加工,需几天完成任务. while they were having a meeting ,3 while they were having awhile they were having a meeting ,3 psychiateists had an interesting." people are always coming to v___ us with their guilt and fears" one said ,"but we have no one to talk about our p___ Si 空格 we were in beijinglibrary that day; a :it happened that; b:it was happened that如果b改成it was happening that; 英译汉5句1>.Over 160 years ago,there no stamps in the world.2>.A postman came to a small village in England.3>."I'm sorry.I don't have enough money for it." 4>."There's nothing inside."5>.About twenty years later,the first stamp in the world bega 英译汉(5句)1.watch the dragon boatraces2.blow out the candles3.do morning exercises4.visit relatives and friends5.have a chat