矩阵和矩阵相乘 a11a12 C C12 a21 a22 b2 b22 … C=AB= C21 C22 C2k n…amb b之 Cn2 Cnk nxm m×k nxk 矩阵和矩阵相乘             =                         = = n n n k k k m m m k k k n n n m m m c c c c c c c c c b b b b b b b b b a a a a a a a a C AB             1 2 2 1 2 2 2 1 1 1 2 1 1 2 2 1 2 2 2 1 1 1 2 1 1 2 2 1 2 2 2 1 1 1 2 1 nm mk nk