We investigate additive-multiplicative bases in F-p. Let A, B subset of F-p*, s > 2, and lambda(1), lambda(2),..., lambda(s) is an element of Fp*. It is proved that Sigma(s)(i=1) lambda(i) AB = F-p, provided min {|B|(s/2)|A|((s-2)/2), |A|(s/2)|B|((s-2)/2)} > p(s/2).