選修數學(I)2-3矩陣-行列式與克拉瑪公式
3 3 3 2 2 2 1 1 1 d b c d b c d b c ⇒∆x = 3 3 3 3 3 2 2 2 2 2 1 1 1 1 1 a x b y c z b c a x b y c z b c a x b y c z b c + + + + + + = 3 3 3 2 2 2 1 1 1 a x b c a x b c a x b c = 3 3 3 2 2 2 1 1 1 a b c a b c a b c =x× =x⋅∆ ∆ ∆ ⇒x = x ,同理 ∆ ∆ = ∆ ∆ y = y,z...