function X = moindres_carres_ponderes(D_app, probas)

    x = D_app(1,:)';
    y = D_app(2,:)';

    A = [ 
        probas' .* [x.^2, x.*y, y.^2, x, y, ones(length(x), 1)] ;
        [1, 0, 1, 0, 0, 0]
    ];

    O = [ zeros(length(x), 1) ; 1 ];

    X = A \ O;

end