求解下列微分方程: (1)xdy+(y-x4)dx=0; (2)(x2-1)yˊ+2xy-cosx=0; (3)(x-2xy-y2)dy/dx+y2=0; (4)ydx+(y-x)dy=0.

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问题 求解下列微分方程:
(1)xdy+(y-x4)dx=0;    (2)(x2-1)yˊ+2xy-cosx=0;
(3)(x-2xy-y2)dy/dx+y2=0;  (4)ydx+(y-x)dy=0.

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