Pregunta: 密27. me fin 5-20 Find the locel masximum and minimum values and sadile point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. the 27 28 29 30 5. f(x, y) = x2 + xy + y2 + y 6. f(x, y) = xy-2x-2y-x2-y2 7. f(x, y) (x-y( - xy) 8. f(x, y)-y(e

密27. me fin 5-20 Find the locel masximum and minimum values and sadile point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. the 27 28 29 30 5. f(x, y) = x2 + xy + y2 + y 6. f(x, y) = xy-2x-2y-x2-y2 7. f(x, y) (x-y( - xy) 8. f(x, y)-y(e 1) 3' th 10. f(x, y) 22xy 11. f(x, y) x 3x + 3xy 12. f(x,y) x3 + y3-3x2-3y2-9x 13-Y(x,y)-/-2x2 + Уз-ЗУ 14. f(x, y)y cos x 15. f(x, y) -e* cos y 16. f(x, y) rye +22 17. f(x, y)xy e" 18. f(x, y) = (x2 + y*)c" 20. f(x, y) = sin x sin y, -π < x < π, -π < y < π 21. Show that f(x, y) x2 +4y4xy 2 has an infinite