【单选题】A,B为n阶矩阵,若(A+B)(A-B)≠A^2-B^2,则必有( )
【简答题】在记账凭证账务处理程序下,记账凭证一般使用__________,________ 和 ______等专用记账凭证,也可采用_______ .
【单选题】-Aren't you from Dandong? -___________. I'm from Shenyang.
【单选题】设A和B均为n×n矩阵,则必有 A.|A+B|=|A|+|B|.
【单选题】You are from Australia,aren't you? _________ . I 'm from Canada.
【简答题】请仔细阅读题,从A、B、C、D中找出其相对应的内容, 并回答小题 小题1:My philosophy(哲学) of life is work. When work is a pleasure, life is joy! When work is duty, life is slavery(苦役). 小题2:Bill Bowl always felt sad. His friend told him...
【简答题】设A为正定Hermite矩阵,B为反Hermite矩阵.试证明:AB与BA的特征值实部为零. (2)设A是n(n>1)阶正定矩阵.α是非零列向量,且α∈Rn.令B=AααT,求B的最大特征值以及B的属于这个特征值的特征子空间的维数和一个基.
【判断题】计算元件功率不能使用叠加定理。A. √ B. ×
【简答题】Long ago there was a poor farmer in Russia. He had been very__ 1 __with everything he had. However,when he found his elder brother was_2__than him,he felt disappointed. So he__ 3 _hard about how he co...