function [f, gruposseparables] = ejemplo5(k, x)
f(1) = -x(1) - x(3) + (7.04376855061002*x(1)^(14/23)*x(2)^(9/23)) / k^1.2345;
f(2) = -x(2) - x(4) + (0.64549722436790*x(3)^0.5*x(4)^0.5) / k^6.78910;
gruposseparables = [2, 2];

