• 2022-07-23
    用初等变换法求下列矩阵的逆矩阵.[p=align:center][tex=7.643x3.643]075gCzZzsMRb6HYXYk9X9+LhKwEfeQLUt/9zH8jmuN4Jh7g6rvzwwynnjhPEJZjdft1o04KIcC1kfEAiSNvWC9sF5EYxYsmHEnUEDnxylgAcJ7V7Qw4KLEACC4FcHls1[/tex]
  • 解   用 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 表示所给 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex] 阶矩阵,将 [tex=3.286x1.357]PSz32Yjlxl8Kq8z5ypLE+gzNNYYH4mrhRpZR75qZBdI=[/tex] 进行行变换,当 [tex=0.786x1.0]O9mrDPbtU/j67mXVbT2dlg==[/tex] 变为 [tex=0.929x1.214]rsWweGkbA/qw3j052Y4lOA==[/tex] 时,[tex=0.929x1.214]rsWweGkbA/qw3j052Y4lOA==[/tex] 就变成了 [tex=1.714x1.214]lyx+LAuGxVE+8PS7wA6fQg==[/tex],即 [tex=12.357x1.571]PSz32Yjlxl8Kq8z5ypLE+l+21KE3AMAf7uET25lexZyyASkrxpP9Ppmizq7mKfxjkRR4EUabaRMB9YbrWUy8DM2Zh0ycPqCV2LTDCq2RfBvpEvoQCkcu2rjfJtovaEbFlTV1nLBfiuxpalmDbz90kg==[/tex][p=align:center][tex=11.214x3.929]dMhZm1sPmKyIMGXzrINMnhgeLnaOIwzfThoHFd5t/Tg0T1c4sfWmGYkKk7JUY/c4J4uJ6NA50ltav5tcJj4IJijOZTfTEwND6jPpgTXXBlYGPrjrFc8DtV16qXw9oLKE[/tex].

    举一反三

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    • 0

      【阅读理解(选择)/完型填空】基于以下描述回答 1-2 题: 下表是 9 名评委对 10 名学生的毕业设计进行等级评定结果: 评委 A B C D E F G H I J 1 1 2 4 3 9 6 5 8 7 10 2 1 4 2 5 6 7 3 10 8 9 3 1 3 4 5 2 8 9 6 10 7 4 1 3 4 5 2 6 10 8 7 9 5 1 9 2 5 6 3 4 8 10 7 6 1 4 9 2 5 6 7 3 10 8 7 1 3 5 10 2 6 9 7 8 4 8 1 3 5 7 6 4 8 10 2 9 9 1 2 8 4 9 6 3 7 5 10

    • 1

      >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']

    • 2

      set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}

    • 3

      【单选题】MATLAB中指令:a = 1: 2: 10,生成矩阵a,矩阵对应矩阵() A. [1 3 5 7 9 11] B. [1 3 5 7 9 ] C. [1 3 5 7] D. [2 4 6 8]

    • 4

      下列数组声明语句中正确的是( )。 A: Dim A(9) As Single = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 } B: Dim A( ) As Single = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 } C: Dim A( ) As Single = { 1, "abc", "ccc", 4, 5, 6, 7, 8, 9, 10 } D: Dim A( , ) As Single = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }