> 数学 >
设A为三阶矩阵,且|A|=二分之一,求|(3A)^-1 - 2A^*|的值.
人气:174 ℃ 时间:2020-03-28 11:04:57
解答
(3A)^(-1) = (1/3) A^(-1)A* = |A|A^(-1) = (1/2) A^(-1)所以 |(3A)^-1 - 2A^*|= | (1/3) A^(-1) - (1/2) A^(-1) |= | (-2/3) A^(-1) | = (-2/3)^3 | A^(-1) | = (-2/3)^3 * 2 = - 16/27.
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版