【简答题】设三阶矩阵 若A的伴随矩阵的秩为1,则必有 A.a=b或a+2b=0 B.a=b或a+2b≠0 C.a≠b且a+2b=0 D.a≠b且a+2b≠0
【单选题】It is easy to see why many little girls prefer to ______ with the male role, but the girl who does find the male role more attractive is faced with a dilemma.
【多选题】下列说法正确的是 [ ]
C.
AgF,AgCl,AgBr,AgI的溶解性依次减小
D.
F 2 ,Cl 2 ,Br 2 、I 2 的氧化性逐渐减弱,都能与Fe反应生成Fe 3+
【单选题】—Why do you like Mary? —Because she is honest girl.
【简答题】设A为n阶矩阵,|A|≠0,A*为A的伴随矩阵,E为n阶单位矩阵.若A有特征值λ,则(A*)2+E必有特征值________.
【单选题】设三阶矩阵 ,若 的伴随矩阵的秩为1,则必有( ).
【单选题】设3阶矩阵 ,若A的伴随矩阵的秩为1,则必有