Cho ma trận A=(0 −1 1 1) A.nn∖[ABT=45n∖]B.nn∖[AB^T=48n∖]C.nn∖[ABT=(45)n∖]D.nn∖[ABT=(48) . Tìm A^-1.
11/30
Cho ma trận \[A = \left( {\begin{array}{*{20}{c}}0&{ - 1}\\1&1\end{array}} \right)\]
\[A.nn{\rm{\backslash }}[A{B^T} = 45n{\rm{\backslash }}]B.nn{\rm{\backslash }}[A{B^T} = 48n{\rm{\backslash }}]C.nn{\rm{\backslash }}[A{B^T} = (45)n{\rm{\backslash }}]D.nn{\rm{\backslash }}[A{B^T} = (48)\]
. Tìm A^-1.
\[{A^{ - 1}} = \left( {\begin{array}{*{20}{c}}1&0\\{ - 1}&1\end{array}} \right)\]
\[{A^{ - 1}} = \left( {\begin{array}{*{20}{c}}1&{ - 1}\\1&0\end{array}} \right)\]
\[{A^{ - 1}} = \left( {\begin{array}{*{20}{c}}1&1\\{ - 1}&0\end{array}} \right)\]
\[{A^{ - 1}} = \left( {\begin{array}{*{20}{c}}0&1\\1&{ - 1}\end{array}} \right)\]
\[\left\{ {\begin{array}{*{20}{l}}{5x + 4y + 2z = 2,}\\{6x + 3y + mz = 2,}\\{x + 2y + 3z = 5}\end{array}} \right.\]
Chọn đáp án B