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求线性表达A=（2 ,3, -1）^T,a1=(1 ,-1 ,2)^T,a2=(-1 ,2 ,-3)^,a3=(2 , -3 ,6)^T 关于游泳的 说出为什么 作文：怎样的暑假,内容写的是游泳 暑假趣事的作文,游泳的,亲 五黄煞方位在哪怎么计算的 我长的太丑,害怕镜子怎么办? 2c的平方减5ac加2a的平方等于0 e等于a分之c e大于1 求e 海鸥盘旋着改为比喻句 高中物理电磁感应定律问题图片里划线的两个公式是怎么得到的?求过程和分析 各类都行 无视我写的字 初一数学题 求阴影部分面积与总面积之比. 上海外语教育出版社 基础口译教程 mp3 和基础听力教程mp3下载 During this season,the Challenge Club played 42 matches:of these,34 were league and Cup games,and the rest were friendly matches.In the League,the Club finished in third place.Club managed to reach the semi-final of the Challenge Cup for the first ti 请帮忙翻释这篇文章In the last 500 years,nothing about people--not their clothes,ideas,or languages---has changed as much as that they eat.The original chocolate drink was made form the seeds of the cocoa tree by South American Indians.The Sp 计算阴影部分面积,急!就是第三题,要求列出式子,并解释为什么那样列,谢谢!答出一定给分 it is necessary not only to present the information impartially but also the data are shown insuch a way that is clearly understood by the user. 判断向量组a1=(1,0,2),a2=(1,1,1),a3=(3,1,5)是否线性相关 恒星的位置是恒定不变的吗?为什么? 判断向量组A1=(2,1,1).A2=(1,2,1).A3=(0,1,2)是否线性相关. 恒星时是固定不变的吗?我问的是恒星时! 具体判别下列向量组是否线性相关?a1=(-1 3 1 ) a2=(2 1 0 ) a3=(1 4 1 ) 请帮忙翻释一下Costs and revenues involving more than one accounting period cannot be determined with precision how much of the portion they have expired at the end of each accounting period involved. 实数0.5属于十进制数吗?RT 阳历生日数字相加如何算性格?我看人在算,计算相加数字后,还写了1—9的数字,然后画形状圈圈,怎么算 请写出两个一元一次方程,使他们的解均为x=-5,怎么写? 分别写一个含有三个加数且满足条件的等式.（1）至少有一个加数是正整数,和是－50.（2）一个加数是正数,一个加数是负数,另一个既不是正数也不是负数,和是－15. -0.2 和 1.5是实数吗? 已知a为实数,则点(-5,0)在?上, 在[0,1]中任意取两个实数,求这两个实数的和大于6/5的概率 请你写出一个含有三个加数,且至少有一个是加数是正整数,和为付三的算式