作者yyc2008 ()
看板Grad-ProbAsk
标题Re: [理工] [线代]-行列式证明题
时间Thu Dec 3 17:14:17 2009
※ 引述《ruby791104 (阿年:))》之铭言:
: 2.Let A and B be 2 ×2 matrices.
: (a)Does det(A+B) = det(A) + det(B)?
Wrong
Eg. A = B = I
: (b)Does det(AB) = det(A)det(B)?
Right
only 2*2
You can expand it.
: (c)Does det(AB) = det(BA)?
Right
det(AB) = det(A)det(B)
= det(B)det(A)
= det(BA)
: Justify answers.
: 以上,麻烦好心的大大!(鞠躬
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.109.103.226
1F:推 windysoul:刚好 我打得是第一小题XDD 12/03 17:19
2F:→ yyc2008:Good! 12/03 17:27