(後只人季 三阶行列式的计算 11 13 记 21 22 32 33 1122033 aa 1223431 132132 1322u31 122133 11230323 1 3 2 3 3 2 1 2 2 2 3 1 1 1 2 1 3 a a a a a a a a a A = 3 1 3 2 3 3 2 1 2 2 2 3 1 1 1 2 1 3 a a a a a a a a a A = 11 22 33 = a a a . − a11a23a32 13 21 32 + a a a 12 23 31 + a a a − a13a22a31 − a12a21a33 记 三阶行列式的计算