简单计算一下即可，答案如图所示
如图所示
dy/dx+y/x=(sinx)/xxdy/dx+y=sinxd/dx(xy) = sinxxy = ∫ sinx dx= -cosx + Cy|(x=π)=1π = -cosπ +CC = π-1iexy =-cosx + π-1y = (-cosx + π-1)/x
