Define the perturbation method. Formulate an expression for the energy of a helium atom considering electron-electron repulsion as a first-order perturbation.

The perturbation method is a mathematical approach used in quantum mechanics to solve complex problems by starting with a solvable system and then introducing small corrections. It is especially useful when the exact solution to a system is difficult or impossible to find. In this method, the total Hamiltonian of the system is written ____ _______ ____ _________ _____ _____.
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