圖片參考：http://img153.imageshack.us/img153/6304/65633019.jpg
evaluate the expression
更新1:
我想問一下 若上面變成ABC+ADC, 不是應該AC(B+D)?點解會係A(B+D)C?
matrices
2011-08-10 6:21 pm
圖片參考：http://img153.imageshack.us/img153/6304/65633019.jpg
evaluate the expression
回答 (2)
2011-08-10 7:50 pm
✔ 最佳答案
圖片參考：http://i1191.photobucket.com/albums/z467/robert1973/Aug11/Crazymat2.jpg
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
2011-08-10 13:18:31 補充：
因為 matrix multiplication is NOT commutative, i.e.
AB = BA is NOT necessarily true.
參考: 原創答案
2011-08-10 9:50 pm
A is a 2 (row) x 3 (column) matrix. C is a 2 x 1 matrix, how can they be multiplied?
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110810000051KK00258