Recently Tang et al put forward two new operations G_(1)■_(k)G_(2)and G_(1)◆_(k)G_(2)of graphs G_(1)and G_(2),and obtained the distance spectrum of G_(1)■_(k)G_(2)and G_(1)◆_(k)G_(2)of regular graphs G_(1)and G_(2).In this paper,we characterize the adjacency spectrum,the Laplacian spectrum and the signless Laplacian spectrum of G_(1)■_(k)G_(2)and G_(1)◆_(k)G_(2)in terms of adjacency spectrum of regular graphs G_(1)and G_(2).
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