210-1 2 1例1：计算行列式D=0１30131解：M,=1引--2, M,=1=M,=1 =-1, M,=1-2,M,- =6, M,=1=-1它们的代数余子式为F$2.8Laplace定理§2.8 Laplace定理 1 2 1 4 0 1 2 1 1 0 1 3 0 1 3 1 D − 例1：计算行列式 = 解： 1 1 2 2, 1 0 M = = − 2 1 1 0, 1 1 M = = 3 1 4 1, 1 3 M = = − 5 2 4 6, 0 3 M = = 4 2 1 2, 0 1 M = = 6 1 4 1 1 3 M = = − 它们的代数余子式为