2矩阵的运算 相等 A=B,[a]=[bij] (3.13) 加法 A+B=C,cij=aj+bij (3.14) 数乘 A=C,C=λa (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+b)A=aA+bA,(A+B)=AA+AB2 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