3.求下列曲面在所示点处的切平面与法线:-|||-(1) -(e)^2x=0, 在点(1,1,2);-|||-(2) dfrac ({x)^2}({a)^2}+dfrac ({y)^2}({b)^2}+dfrac ({z)^2}({c)^2}=1 在点 (dfrac (a)(sqrt {3)},dfrac (b)(sqrt {3)},dfrac (c)(sqrt {3)})()