5. (3%) Let a,b,k,n be integers. Which of the following statements is not coTect?
(A) a ≡b (mod n) ka≡ kb (mod n)
(B) a≡b (mod kn) a≡b (mod n)
(C) a≡b (mod n)   ka≡ kb (mod kn)
(D) a≡b (mod n)a≡b (mod kn)

相關試題

相關試卷