Optimization of a multi-objective function 

Hello, everyone, 

Please I am looking for the minimum of the multi-objective function given in the joined file.

If an analytical solution is possible, please, provide it. if it is not possible please say why, and use a numerical method(weighted sum method, Pareto optimality...). f1 is more important than f2 and f3. f2 and f3 are at the same level of importance.

Please give all the calculations and method details. 

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