CALCULUS(GENERAL MATHEMATICS)(A)(2) test 3rd 2007/5/21 I.Find the equation of the tangent plane to the surface 2xy^2 + 3x^2 - 2z^2 = 3 at the point(1,2,2).(30%) II.Let D = {(x,y)|x^2 + y^2 <= 40} be a thin plate and the temperature at the point (x.y) on the D is T(x,y) = 3xy + 4y^2. Find the highest and lowest temperatures. (40%) III.Find the maximum value of f(x,y,z) = 2xy + yz subject to the constraints x + 2y = 6, 2x - 3z = 0. (30%) 有人愿意详解一下吗？ 口口口我恨bbs 都什麽时代了=.= ※ 编辑: benimut 来自: 61.228.245.1 (05/10 10:30)