• 2022-06-29
    设A是一个n阶方阵,已知│A│=2,则│-2A│等于:()
    A: (-2)n+1
    B: (-1)n2n+1
    C: -2n+1
    D: -22
  • B

    内容

    • 0

      设\( A \) 为 \( n \)阶方阵且 \( \left| A \right| \ne 0 \),则 \( {(2A)^{ - 1}} = \)( ) A: \( {1 \over 2}{A^{ - 1}} \) B: \( {2^{n - 1}}{A^{ - 1}} \) C: \( {2^n}{A^{ - 1}} \) D: \( 2{A^{ - 1}} \)

    • 1

      设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]

    • 2

      设\(A\)为\(n\)阶方阵,\(\left| A \right| = 2 \),则\(\left| {\left| A \right|{A^T}} \right|=\) A: \({2^{n + 1}} \) B: \({2^{n }}\) C: \({2^{n - 1}}\) D: \(2\)

    • 3

      设A是n阶矩阵,A=½E,则 |A|=( )。 A: (1/2)^n B: 2^n C: 1/2 D: 2

    • 4

      设A,B为n阶方阵,已知|A|=-3,|B|=2,则|2A^(-1)B*+A*B^(-1)|=