y``=x`*y+x*y`+e^(y)*y`
y``=y+xy`+e^(y)*y`
y```=y`+x`*y+x*y`+e^(y)*y`*y`+e^(y)*y``
y`=xy+e^(y)
y`(0)=0*0+e^(0)
y`(0)=[b]1[/b]
y``=y+xy`+e^(y)*y`
y``(0)=0+0*1+e^(0)*1
y``(0)=[u]1[/u]
y```=y`+x`*y+x*y`+e^(y)*y`*y`+e^(y)*y``
y```(0)=1+0*0+0*1+e^(0)*1*1+e^(0)*1
y```(0)=3 ( а надо бы 4)
y=y(0)+[b]y`(0)[/b]*x+[u]y``(0)[/u]*(x^2/2)+y```(0)*x^3/3!
y=0+x+(1/2)x^2+(4/6)x^3
[b]y=x+(1/2)x^2+(2/3)x^3[/b]