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This paper deals with a coupled Hartree system with Hardy-Littlewood-Sobolevcritical exponent  \begin{equation*}  \begin{cases}  -\Delta u+(V_1(x)+\lambda_1)u=\mu_1(|x|^{-4}*u^{2})u+\beta (|x|^{-4}*v^{2})u,\ \ &x\in R^N,  -\Delta v+(V_2(x)+\lambda_2)v=\mu_2(|x|^{-4}*v^{2})v+\beta (|x|^{-4}*u^{2})v,\ \ &x\in R^N,  \end{cases} \end{equation*} where $N\geq 5$, $\lambda_1$, $\lambda_2\geq 0$with $\lambda_1+\lambda_2\neq 0$, $V_1(x), V_{2}(x)\in L^{\frac{N}{2}}(R^N)$are nonnegative functions and $\mu_1$, $\mu_2$, $\beta$ are positive constants.Such system arises from mathematical models in Bose-Einstein condensates theoryand nonlinear optics. By variational methods combined with degree theory, weprove some results about the existence and multiplicity of high energy positivesolutions under the hypothesis $\beta>\max\{\mu_1,\mu_2\}$

A coupled Hartree system with Hardy-Littlewood-Sobolev critical exponent: existence and multiplicity of high energy positive solutions