※ 引述《xy210742 (Sam)》之銘言：
: 請教各位大大
: http://ppt.cc/qAbg
: 此題矩陣當如何解
: 感恩大大肆賜教
: 謝謝
把方程組寫成矩陣形式就有
[a b] [1 ] = [3], [e f] [m] = [2 ]
[c d] [-2] [4] [g h] [n] [-4]
所以
[a b] [e f] [m] = [a b] [2 ] = 2 [a b] [1 ] = 2 [3] = [6]
[c d] [g h] [n] [c d] [-4] [c d] [-2] [4] [8]
第一個條件代入得
[5 2] [m] = [6]
[7 3] [n] [8]
這即是
{5m+2n=6 解聯立得 {m = 2
{7m+3n=8 {n = -2
--
'You've sort of made up for it tonight,' said Harry. 'Getting the
sword. Finishing the Horcrux. Saving my life.'
'That makes me sound a lot cooler then I was,' Ron mumbled.
'Stuff like that always sounds cooler then it really was,' said
Harry. 'I've been trying to tell you that for years.'
-- Harry Potter and the Deathly Hollows, P.308
--
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