f(x, y) = 4·x^6·y^5 + 5·x^4 + 7·x^2 + 7·y^5 + 5
f'(x, y) = [24·x^5·y^5 + 20·x^3 + 14·x, 20·x^6·y^4 + 35·y^4]
f'(2.3, 1.2) = [4119.303443, 6211.920388]
[4119.303443, 6211.920388]·[2.1, -0.6] = 4923.384997
Die marginale Produktion wird um ca. 4923 ME steigen.