行列式的问题 对称矩阵Let A and B be n × n matrices.Which of the following statements are always true?(i) If det(A) = det(B) then det(A − B) = 0.(ii) If A and B are symmetric,then the matrix AB is also symmetric.若A对称
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行列式的问题 对称矩阵Let A and B be n × n matrices.Which of the following statements are always true?(i) If det(A) = det(B) then det(A − B) = 0.(ii) If A and B are symmetric,then the matrix AB is also symmetric.若A对称
行列式的问题 对称矩阵
Let A and B be n × n matrices.Which of the following statements are always true?
(i) If det(A) = det(B) then det(A − B) = 0.
(ii) If A and B are symmetric,then the matrix AB is also symmetric.若A对称B对称,AB也对称
(iii) If A and B are skew-symmetric(反对称),then the matrix AT + B is also skew-symmetric.
(A) (i) and (ii) only (B) (ii) and (iii) only (C) (i) and (iii) only (D) (iii) only (E) all of them (F) (ii) only (G) none of them (H) (i) only
行列式的问题 对称矩阵Let A and B be n × n matrices.Which of the following statements are always true?(i) If det(A) = det(B) then det(A − B) = 0.(ii) If A and B are symmetric,then the matrix AB is also symmetric.若A对称
1错
2AT=A BT=B (AB)T=BT AT= BA不一定=AB 也错
3 AT=-A BT=-B
(AT+B)T=A+BT=-AT-B=-(AT+B) 正确
所以选D