The account title of a T account appear above the T. Debit entries are depicted to the right of the "T" and credits are shown to the left of the "T".
举一反三
- 设向量组\( {\left( {2,1,1,1} \right)^T},{\left( {2,1,a,a} \right)^T},{\left( {3,2,1,a} \right)^T},{\left( {4,3,2,1} \right)^T} \) 线性相关，且\( a \ne 1 \) ，则 \( a = \)______
- The T account got its name because it resembles the letter “T”.（2分）
- 设`\A`是`\m \times n`矩阵，`\m` 小于 `\n`，则必有 （ ） A: \[\left| {{A^T}A} \right| \ne 0\] B: \[\left| {{A^T}A} \right| = 0\] C: \[\left| {A{A^T}} \right| > 0\] D: \[\left| {A{A^T}} \right| < 0\]
- 设\( \alpha {\rm{ = }}{\left( {1,0,1} \right)^T},\,A = \alpha {\alpha ^T} \)，则\( \left| A \right|{\rm{ = }} \)______
- 设 \( A \)为 \( m \times n \)矩阵， \( B \)为 \( n \times m \)矩阵，则下列结论中不正确的是（ ） A: \( {\left( {AB} \right)^T} = {B^T}{A^T} \) B: \( \left| {AB} \right| = \left| {BA} \right| \) C: \( tr\left( {AB} \right) = tr\left( {BA} \right) \) D: \( {A^T}A,\;B{B^T} \)均为\(n\)阶对称阵