首页/ 题库 / [单选题]设A是n阶方阵,α是n维列向量,下列运算的答案

设A是n阶方阵,α是n维列向量,下列运算无意义的是().

单选题
2021-12-25 12:07
A、αTAα
B、ααT
C、αA
D、Aα
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正确答案
C

试题解析
(A)有意义,它是1×n阵、n×n阵、n×1阵依次相乘,乘得的结果是1×1阵,即是一个数.(B)有意义,它是n×1阵与1×n阵相乘,乘得的结果是n阶方阵.(D)有意义,它是n×n与n×1阵相乘,乘得的结果是列向量.(C)无意义,因为n×1阵与n×n阵不能相乘,故选(C).

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