AS Al"mira Sakieva Ответ. W=0,5*C*U^2; U=U1-U2; U1=J*Ro; U2=0,5*J*R; Ro=(2*R)/2+R=2*R; J=E/(2*R+r);r=0; J=E/(2*R); U1=E; U2=0,5*E; U=0,5*E; W=0,125*C*E^2;