複選題
37.已知A、B、C均為2階方陣,則下面哪些選項恆正確?
(A)A+(B+C)=(A+B) +C
(B)(AB)C = A(BC)
(C)A(B+C)=AB+AC
(D)AB = BA
(E)A+ B = B + A

答案：登入後查看
統計： A(12), B(11), C(11), D(3), E(7) #2707942