度门六了 数学科学学院线性代数教学组 SITASAY 100 0a00「CC A 0b1|G3 011b 即 00 12 A 31 0 0 0 0 0 1 0 1 0 1 1 a a A b b     =   1 2 3 4 , C C C C   =     A       = =       a 1 C1 0 0 C2 0 1 1 0 0 a C3 b b 1 1 0 0 C4 即