1.求下列微分方程的通解:-|||-(1) '=dfrac ({x)^2}(y(1+{x)^3)} =-|||-(2) '+(y)^2sin x=0 ;-|||-(3) '=sqrt (1-{y)^2} ;-|||-(4) '-yln y=0 ;-|||-(5) sqrt (1-{x)^2}y'=sqrt (1-{y)^2} ;-|||-(6) dfrac (dy)(dx)=dfrac (x-{e)^-x}(y+{e)^y}