乘法满足(AB)C=A(BC); 孔(AB)=(4)B=A(AB),(其中4为数); A(B+C)=AB+AC, (B+C)A= BA+CA EnmA nxn nxn nxnn· 矩阵乘法不满足:交换律、消去律5 乘法满足 (AB)C = A(BC); (AB) = (A)B = A(B), (其 中为 数); ( ) ; ( ) , B C A BA CA A B C AB AC + = + + = + E A A A E . m mn = mn = mn n 矩阵乘法不满足：交换律、消去律