如图,在矩形\(ABCD\)中,对角线\(AC\)与\(BD\)相交于点\(O\),点\(E\)是\(BC\)上的一个动点,连接\(DE\),交\(AC\)于点\(F\).
\((1)\)如图\(①\),当\( \dfrac{CE}{EB} = \dfrac{1}{3} \)时,求\( \dfrac{{S}_{\triangle CEF}}{{S}_{\triangle CDF}} \)的值;
\((2)\)如图\(②\),当\( \dfrac{CE}{EB} = \dfrac{1}{m} \)时,求\(AF\)与\(OA\)的比值\((\)用含\(m\)的代数式表示\()\);
\((3)\)如图\(③\),当\( \dfrac{CE}{EB} = \dfrac{1}{m} \)时,过点\(F\)作\(FG⊥BC\)于点\(G\),探索\(EG\)与\(BG\)的数量关系\((\)用含\(m\)的代数式表示\()\),并说明理由.