所屬科目：研究所、轉學考(插大)-微積分
a. y =
b. f(x) = 5(x4-x)7
c. g(x) =
2.The total weekly revenue (in dollars) of the company realized in manufacturing and selling its rolltop desks is given by R(x, y) = -0.2x² - 0.25y² - 0.2xy + 224x + 180y where x denotes the number of finished units and y denotes the number of unfinished units manufactured and sold each week. The total weekly cost attributable to the manufacture of these desks is given by C(x, y) = 120x + 80y + 2000 dollars. Determine how many finished units and how many unfinished units the company should manufacture each week in order to maximize its profit. What is the maximum profit (P) realizable?
3.The present value of a perpetual stream of income that flows continually at the rate of p(t) dollars per year is given by the formula PV = where r is the interest rate compounded continuously. Using this formula, find the present value of a perpetual net income stream that is generated at the rate of p(t) = 30000 + 2000t dollars per year.
a.
b. ∫ x8(2x9-1)6dx
5.Find the second-order partial derivatives of the function f(x, y) = x4y - xy3. Show that the mixed partial derivatives fxy and fyx are equal.
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where r is the interest rate compounded continuously. Using this formula, find the present value of a perpetual net income stream that is generated at the rate of p(t) = 30000 + 2000t dollars per year.