∵y'=e^(x+y) ==>y'=e^x*e^y
==>e^(-y)dy=e^xdx
==>e^(-y)=C-e^x (C是积分常数)
==>y=-ln|C-e^x|
∴原微分方程的通解是 y=-ln|C-e^x| (C是积分常数)