用构造的方法给出图K_4-P(n,2),K_3-P(n,2)和I(K_(1,1,n))的优美标号,并证明了图K_4-P(n,2),K_3-P(n,2)和I(K_(1,1,n))都是优美图.
We prove that K4-P (n,2),Ka-P (n,2) and I(K1,1,n) a.re graceful graphs by using the constructive method, which gives the graceful labeling of graphs K4-P (n, 2), K3-P (n, 2) and I(K1,1,n).