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谁能说一句积极向上的话,对生活.最少150字. 怎样理解积极向上这个词 与向量a=(-4,3)垂直的单位向量是 已知a=(3,4)则与a垂直的单位向量坐标是（ ）A:(5分之根号5,-5分之2倍根号5）或（-5分之根号5,-5分之2倍根号5）B:(5分之根号5,-5分之2倍根号5）或（-5分之根号5,5分之2倍根号5）C:(5分之2倍根号5,-5 已知i,j分别是x,y轴正方向上的单位向量,OB1=ai+2j,对任意正整数n,向量BnB(n+1)=51i+3*2^(n-1)j为什么向量OBn=OB1+B1B2+……+B(n-1)Bn 已知向量t,j分别是x,y轴正方向的单位向量,向量OB=ai+2j,对于任意正整数n,向量BnB(n+1)=51i+3*2^(n-1)j已知向量i,j分别是x,y轴正方向上的单位向量,向量OB1=ai+2j,对任意正整数n,向量BnB(n+1)=51i+3*2^(n-1)j,若 已知向量AB=i-2j,并且i,j分别是x轴y轴正方向上的单位向量,则向量AB用坐标表示答案为什么是（1,-2）,不理解 若一立方体的体积变成原来的27倍,得其表面积变成原来的多少倍?请说明理由 句子成分划分来旅游还是来做生意的句子成分怎么划分 跟君组成词语的都有什么啊 在一条马路的一旁种树,每隔6米种一棵,且两端都种,一共中树41棵.这条马路长多少米?如果改为每隔5米种一棵,那么一共种树多少棵?用式子回答,不要方程, 复数4+3i与-2-5i分别表示向量OA与OB,则向量AB表示的复数是? 用夹逼准则证明：lim(1+1/x)^x=e 英语翻译请重点解释两个“媚”字有何不同?回答者第一楼：俺可不是想学英文的!回答者第二楼：“春景也在取悦着游人”这一句翻译可不好理解了：春景怎么会取悦游人呢?春景有什么必要 f(x)是R上的奇函数,当x>0时,f(x)=sinx+cosx,求f(-π/6) 向量（AB+MB)+（BO+BC)+OM等于?以上AB、MB、BO、BC、OM全部为向量 向量(AB+MB)+(BO-CB)+OM化简后= 向量AB+向量MB)+(向量BO+向量BC)+向量OM 怎么求 Gmat语法疑问,关于同位语.最近看到关于同位语的一个语法：“同位语结构中名词的数可以和其修饰对象的数不一样”.哪位大虾能不能给我举个例子, GMAT语法问题求解Several educational research groups are denouncing the mayor's proposal of a system by which individual teachers would be given raises or bonuses "should it be that test scores show their students' mastery of read GMAT语法问题,求高人指点. GMAT语法,逻辑谓语疑问By 1940, the pilot Jacqueline Cochran held seventeen official national and international speed records, and she earned them at a time when aviation was still so new formany of the planes she flew to be of dangerously expe GMAT语法时态问题A 1972 agreementbetween Canada and the United States （reduced the amount of phosphatesthat municipalitieshad been allowed to dump） into the Great Lakes.(A) reduced the amountof phosphates that municipalities had been allowed 在复平面内,O为坐标原点,向量oa对应的复数为-2-i,若点a关于直线y=-x的对称点为b,则向量ob对应的复数为 设向量a,b均为单位向量,且（a+b)²=1,则ab夹角为?我算出了,（a+b)²=a²+b²+2ab,但我看答案a²+b²直接成了2,就成了2+2ab=1,a²+b²=2是怎么知道的 名人正确认识自己的事例 (向量AB+向量MB)+向量BO+向量OM 怎么算啊?拜托各位大神 GMAT的语法题New theories propose that catastrophic impacts ofasteroids and comets may have caused reversals inthe Earth’s magnetic field,the onset of ice ages,splitting apart continents 80 million years ago,andgreat volcanic eruptions.􀂃 一道GMAT 语法题Beatrix Potter,in her book illustrations,carefully coordinating them with her narratives[/u],capitalized on her keen observation and love of the natural world.(A) Beatrix Potter,in her book illustrations,care-fully coordinating th Gmat 语法题求答案71. Unlike the original National Museum of Science andTechnology in Italy, where the models are encased inglass or operated only by staff members, the VirtualLeonardo Project, an online version of the museum,encourages visitors 一道GMAT语法题~By applying optimization techniques commonly used to plan operations,it is possible to determine how much effort ought to be devoted to each of a company’s products in order to meet its goals in both the short and long terms.\x0 向量a²= |a|² 是否正确