设 A 为 3 阶方阵，特征值分别为 -2， 1 ，1，则| 5A -1 |=______________.
-125
暂无解析
“In reply, we wish to inform you that we are well connected with major dealers in the line of textiles.”怎么翻译？
对等样品也称为()
设随机变量X的概率密度为f(x)=则P{0≤X≤}=()
按受方的实际利润作为提成基价，对供方是比较有利。()
根据产品生命周期理论，产品成熟期应选择()
则P{0≤X≤}=()