求该矩阵的行列式已知A是一个3*3的矩阵,I是3*3的标准矩阵.且:det(A+I)=0,det(A+2I)=0,det(A+3I)=0问det(A+4I)是多少?我能猜到答案是6……看做对角线上是-1,-2,-3的对角矩阵可是如何证明?知道了det(A),那
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![求该矩阵的行列式已知A是一个3*3的矩阵,I是3*3的标准矩阵.且:det(A+I)=0,det(A+2I)=0,det(A+3I)=0问det(A+4I)是多少?我能猜到答案是6……看做对角线上是-1,-2,-3的对角矩阵可是如何证明?知道了det(A),那](/uploads/image/z/1055874-66-4.jpg?t=%E6%B1%82%E8%AF%A5%E7%9F%A9%E9%98%B5%E7%9A%84%E8%A1%8C%E5%88%97%E5%BC%8F%E5%B7%B2%E7%9F%A5A%E6%98%AF%E4%B8%80%E4%B8%AA3%2A3%E7%9A%84%E7%9F%A9%E9%98%B5%2CI%E6%98%AF3%2A3%E7%9A%84%E6%A0%87%E5%87%86%E7%9F%A9%E9%98%B5.%E4%B8%94%EF%BC%9Adet%28A%2BI%29%3D0%2Cdet%28A%2B2I%29%3D0%2Cdet%28A%2B3I%29%3D0%E9%97%AEdet%28A%2B4I%29%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%88%91%E8%83%BD%E7%8C%9C%E5%88%B0%E7%AD%94%E6%A1%88%E6%98%AF6%E2%80%A6%E2%80%A6%E7%9C%8B%E5%81%9A%E5%AF%B9%E8%A7%92%E7%BA%BF%E4%B8%8A%E6%98%AF-1%2C-2%2C-3%E7%9A%84%E5%AF%B9%E8%A7%92%E7%9F%A9%E9%98%B5%E5%8F%AF%E6%98%AF%E5%A6%82%E4%BD%95%E8%AF%81%E6%98%8E%3F%E7%9F%A5%E9%81%93%E4%BA%86det%28A%29%EF%BC%8C%E9%82%A3)
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