求大神帮下忙.(1)已知A为3阶矩阵,|A|=1/3 则 |6A| =(2)设A为三阶可逆矩阵,A^-1 = 1 0 0 则 A* = 0 -2 0-3 4 1
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![求大神帮下忙.(1)已知A为3阶矩阵,|A|=1/3 则 |6A| =(2)设A为三阶可逆矩阵,A^-1 = 1 0 0 则 A* = 0 -2 0-3 4 1](/uploads/image/z/13865065-25-5.jpg?t=%E6%B1%82%E5%A4%A7%E7%A5%9E%E5%B8%AE%E4%B8%8B%E5%BF%99.%EF%BC%881%EF%BC%89%E5%B7%B2%E7%9F%A5A%E4%B8%BA3%E9%98%B6%E7%9F%A9%E9%98%B5%2C%7CA%7C%3D1%2F3+%E5%88%99+%7C6A%7C+%3D%EF%BC%882%EF%BC%89%E8%AE%BEA%E4%B8%BA%E4%B8%89%E9%98%B6%E5%8F%AF%E9%80%86%E7%9F%A9%E9%98%B5%2CA%5E-1+%3D+1+0+0+%E5%88%99+A%2A+%3D+0+-2+0-3+4+1)
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求大神帮下忙.(1)已知A为3阶矩阵,|A|=1/3 则 |6A| =(2)设A为三阶可逆矩阵,A^-1 = 1 0 0 则 A* = 0 -2 0-3 4 1
求大神帮下忙.
(1)已知A为3阶矩阵,|A|=1/3 则 |6A| =
(2)设A为三阶可逆矩阵,A^-1 = 1 0 0 则 A* =
0 -2 0
-3 4 1
求大神帮下忙.(1)已知A为3阶矩阵,|A|=1/3 则 |6A| =(2)设A为三阶可逆矩阵,A^-1 = 1 0 0 则 A* = 0 -2 0-3 4 1
|6A| = 6^3|A| = 6^3 * 1/3 = 72
|A^-1| = -2
|A| = -1/2
A* = |A|A^-1 =
-1/2 0 0
0 1 0
3/2 -2 -1/2