4 下列何者為4xdy − ydx = x2 dy 之解?
(A)(x-4)y = cx
(B)(x-4)y2 = cx
(C)(x-4)y3 = cx
(D)(x-4)y4 = cx

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統計: A(0), B(1), C(0), D(1), E(0) #1044883