x=0时,代入方程得:y(0)=0方程两边对x求导: y+xy'+y'e^y=0, 代入x=0, y(0)=0入上式得:y'(0)=0再对上式继续求导: y'+y'+xy"+y"e^y+y'y'e^y=0将x=0, y(0)=0,y'(0)=0代入上式,得:y"(0)=0