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題組內容

2. Let

(c) (4分) Use the definition of the partial derivative to find af at (x, y) = (0,0).

其他申論題

(a) (6 分) Determine whether the series converges absolutely or converges conditionally or diverges and give reasons for your answer.

(b) (6 分) Find all values of x for whichconverges and give reasons for your answer.

(a) (4 分) Show that f is not continuous at (0, 0).

(b) (4 分) Find the partial derivative at (2,y) if x3 +y3≠0.

3. Find the absolute maximum and minimum values of f(x,y) = x2 + 3y2 + 2y on the unit disk x2 + y2 ≤1.

1. Find the slope of the tangent line to the graph of f(x) =xlnx at the point (e,e).

2. Find the limit

3. Find the volume of the solid bounded above by the surface z= f(x,y) = ex+2y and below by the plane region R, where R is the triangle with vertices (0,0), (1,0), and (0,1).

4. Find the maximum value of on the closed interval [0, 1].

5. Find the limit

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