滿足方程f(x)+2f(x)dx=x2的解f(x)是:()
A.-(1/2)e-2x+x+1/2 B.(1/2)e-2x+x-1/2 C.ce-2x+x-1/2 D.ce-2x+x+1/2
A.y=y1(x)+ B.y=y1(x)+c C.y=y1(x)++c D.y=y1(x)+c
A.y=cy1(x)+y2(x) B.y=y1(x)+c2y2(x) C.y=c[y1(x)+y2(x)] D.y=c1y(x)-y2(x)