variables
  x[2] in (560/663; 213/170);
  t[2] in ([1.19, 1.21];[7.09, 7.11]);
 // t[2] in ([1.19, 1.19];[7.09, 7.09]);

function f(x[2],t[2])
  return(x(1)*(-9/50 + (t(1)*x(2))/(t(2) + x(2))); (9*(57/10 - x(2)))/25 - (1053*t(1)*x(1)*x(2))/(100*(t(2) + x(2))));
end

function v(u[2])
  return(u(1)*(10.398200885822877*u(1) + 0.2637965600928565*u(2)) + (0.2637965600928565*u(1) + 0.364576539870686*u(2))*u(2));
end
