1.假設x,_y>0,下列哪一個效用函數的無異曲線是嚴格凸?
(A) U(x,y) = x3 +y3
(B) U(x,y) = min(x/3,y/2)
(C)U(x,y)2x + 5y
(D) U(x,y) = x3/2y1/2

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統計: A(4), B(1), C(1), D(3), E(0) #1346701