  We investigate the monogamy relations related to the concurrence, the
entanglement of formation, convex-roof extended negativity, Tsallis-q
entanglement and R'enyi-{\alpha} entanglement, the polygamy relations related
to the entanglement of formation, Tsallis-q entanglement and R'enyi-{\alpha}
entanglement. Monogamy and polygamy inequalities are obtained for arbitrary
multipartite qubit systems, which are proved to be tighter than the existing
ones. Detailed examples are presented.
