We study the possibility of defining the (braided) comultiplication fo
r the GL(q)(N)-covariant differential complexes on some quantum spaces
. We discover such differential bialgebras (and Hopf algebras) on the
bosonic and fermionic quantum hyperplanes (with additive coproduct) an
d on the braided matrix algebra BM(q)(N) with both multiplicative and
additive coproducts. The latter case is related (for N = 2) to the q-M
inkowski space and q-Poincare algebra.