元素周期表之歌

阿根廷 墨西哥 匈牙利 土耳其那个综合实力最大 设η1,η2……ηt及k1η1+k2η2+……+ktηt都是非齐次线性方程组AX=b的解向量则k1+k2+k3+……+kt=? 向量组 线性无关与以下那些说法等价 ( )． (A) 存在全为零的实数k1,k2,…,kr,使得k1 + k2 +…+ kr = 0； 向量组α1，α2，α3,...αr 线性无关与以下那些说法等价 ( )．(A) 存在全为零的实数k1,k2,…,kr， 设a1,a2...as线性相关其中任意s-1个向量解线性无关证明必存在一组全解不为零的数k1,k2...ks使得k1a1+k2...设a1,a2...as线性相关其中任意s-1个向量解线性无关证明必存在一组全解不为零的数k1,k2...ks 设α1,α2和β都是N维实向量,k1,k2是任意实数.如果β分别与α1,α2正交,证明β必与k1α1+k2α2正交. 设η1η2.,ηs是方程组AX=b(b≠0)的解向量,若K1η1+K2η2+.Ksηs也是Ax=b的解,证明K1+K2+...+Ks=1 我初一14.36 100米这样算可以吗,怎么才会更快 问几道英文单选题,1 in the seaside resort,you can---------all the comfort and convenience of modern tourism.a,enjoy b.apply c.receive d.achieve2 since tom -------downloaded a virus into hiscomputer,he can not open the file nowa.readily b.horri 单选题 说明原因1.What would you ______ do?A want B want to C like to D to like2.Jim _______stay_______home and read books.A like,at B like,in C what's,does D which,do3.What can we learn ______ Chinese history?A.for B in C of D from 1.Kate King is an Chinese teacher.Her husband(丈夫) Jack is Brown.Then her students can her （ ） A.Mrs King B.Mrs Brown C.Teacher King D.Miss King 古诗的起源与特点 小学六年级诗海拾贝那些古诗和现代诗的起源,特点 ,表现手法,分类和写法 化简a-b/√a+√b,甲乙两同学的解法如下,判断对错甲：(a-b)/(√a+√b)=（a-b)(√a-√b)/(√a+√b)(√a-√b)=√a-√b乙：（a-b)/(√a+√b）=(√a+√b)(√a-√b）/（√a+√b）=√a-√b 对于两同学的解法,你认 初二数学已知三角形的三条边是a ,b ,c,而且满足a² c²- b² c² =a² a² -b&su初二数学已知三角形的三条边是a ,b ,c,而且满足a² c²- b² c² =a² a² -b²b²,判 what did tom do on saturday evening的中文 汽车超市计划5月份销售轿车60辆,上半月完成36辆,上半月完成计划几分之几 求几道英语单选题答案35-38 单选题 35.Directors Mrs B.Fox,Captain W.L.Hunter,RV.Sharpe The headmaster,Chickfield School,Dear Headmaster,Thank you for your telephone message.We shall be happy to welcome your pupils to the Gardens and Park.T 广达汽车计划5月份售轿车60辆,上半月完成36辆,上半月完成全月计划的几分之几结果化成最简分数） 求几道英语单选题的答案1 The heavy snowstorm in early September 2007 reached as much as 1.5 meters in some places,_______hundreds of flight delays.A.having caused B.caused2 Which share is intended_____me?you can take ____half.They are exact 1.An earthquake ______ 5.6 on the Richter scale hit Mianzhu City ,in southwest Chian's Sichuan Province at 2:03 am June 30,2009.measured ,我选 measuring 怎么就错了?2._______ ,he shows no sympathy for the poor .A .Wealthy as he is B.Weathy alth 2道简单英语单选题,请高手说明理由11.— You keep on coughing.What’s the matter?— Oh,I’ve got a cold.Nothing serious,____.A.yet B.indeed C.though D.anyway 12、—Excuse me,officer.I can’t find the subway entrance.____—See thos 春联起源 春联的来历是什么?要“简单明了”一点,不要超过5行. 春联的来历由来急需 春联的由来简介要短,急.100-150字之间 春联来历 几道英语单选题 要详解1.The paperwork is necessary to （ ） will buy a house,so please get prepared in advance.A.whomever B.whoever 2.—— How could Jane make such a mistake —— Although she is a careful girl,she _____ be very forgetf 求详解几道英语单选题 谢谢我手头有正确答案重要的是 请帮忙的朋友附上解释 感激不尽!1.several had passed___the puzzled travelers came to understand what was going on.A. after B. when C. before D. until2. ___is alway 我会一点画画 的英文 一道英语单选题 帮忙选答案解释原因You alaways talk about your pet dog,What's it like?A.It likes meat.B.Three years old.C.It is small and white.D.It likes playing with me. 根据上裱中的数据,试比较2x+1与x²+2的大小,并运用你学过的证实只是证明你的结论如题.表:x -1 1 根号2+1 2x+1 -1 3 2根号2+2 x 比较3x²-2x-1与2x²-2x-5的大小