研究所、轉學考(插大)-微積分題庫下載題庫

11.當f(x,y)=x²+y²+y2texp(2-y),且F(T,3,z)=f(xy)一z。請問下列哪些選項 是正確的?
(A)
(B)
(C)∇F at the point (1,2,-1) is (1,3, -1)^T.
(D) The tangent plane to the graph of the function F(x, y) at the point (1, 1,3) is 3(c-1)+ (V-1)- (z-3)=0.
(E) The minimum value of f(c, y) is 0.