[理工] 聯立方程式 用不同得方法 算出答案完全不同
x'=x+2y+z
y'=6x-y
z'=-x-2y-z
------------------------
我用cramer 法
lD-1 -2 -1 l
l -6 D+1 0 l y = 0
l 1 2 D+1 l
-4t 3t
D(D+4)(D-3)y=0 ==> y=c1 e + c2 e + c3
之後代入 y'=6x-y
得到 x
利用相互的關係得到 xyz
但是跟我用矩陣的方法 求出來的 xyz 答案完全不同 0.0
感覺不知道是不是算的方法有錯誤
希望有大大能指導一下 感恩
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