試題詳解

複選題
3. (5%) Which statements are correct for the equation (2y² +3x)dx+ 2xydy = 0?
(A) The differential equation is exact.
(B) It is possible to find an integrating factor so that the equation becomes exact.
(C) x=-y² is one possible solution.
(D) x²y²+x³ =1 is one possible solution.
(E) None of the above