[理工] 線代
1.
http://ppt.cc/woUZ
他不是已經說 P is nonsingular了 為何還可以令他為det(P)=0?
這樣b=-c要在 singular的情況下才會成立吧...
2.
http://ppt.cc/01UG
e小題問的 為什麼不包含d呢?
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