This paper gives the existence and nonexistence of multiple solutions for the problem:\$\$Δ\+2u=λu+|u|\+\{p-1\}u+μf(x), x∈Ω, μ>0, u|\-\{ Ω\}=0, u n\-\{ Ω\}=0.\$\$Where \$Ω\$ is a smooth bounded domain in \$R\+N,λ∈R,μ>0,p=N+4N-4,N≥5,f(x)\$ is ...