设A为三阶方阵,且 A =3, A.9/8 B.9/2 C.9/64 D.3/

shuhaiku2019-12-17  10

问题 设A为三阶方阵,且 A =3,A.9/8 B.9/2 C.9/64 D.3/2

选项

答案A

解析提示:A2为三阶方阵,数乘矩阵时,用这个数乘矩阵的每一个元素。矩阵的行列式,按行[img]/upload/tiku/190/2457348_1.jpg[/img]
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