2矩阵的运算 相等A=B,[a]=b (3.13) 加法A+B""b (3.14) 数乘A=C,cn=~a (3.15) 对易纪律和结合律 A+B=B+A,入A=A A+(B+C)=(A+B)+C (3.16) (a+ ba=aA+ bA M(A+B)=nA+nB2 矩阵的运算 相等 A = B, [aij] = [bij] (3.13) 加法 A + B =C, cij = aij + bij (3.14) 数乘 A = C, cij = aij (3.15) 对易纪律和结合律 A + B = B + A，A =A A + (B + C）= (A + B) + C (3.16) (a + b)A = aA + bA, (A + B) = A + B