操作示例:如图\(1\),在\(\triangle ABC\)中,\(AD\)为\(BC\)边上的中线,\(\triangle ABD\)的面积记为\(S_{1}\),\(\triangle ADC\)的面积记为\(S_{2}.\)则\(S_{1}=S_{2}\).
解决问题:在图\(2\)中,\(1\)、如图,在\(\triangle ABC\)中,点\(D\)、\(E\)分别是边\(AB\)、\(BC\)的中点,若\(\triangle BDE\)的面积为\(2\),则四边形\(ADEC\)的面积为___________.
拓展延伸:
\((1)\)如图\(3\),在\(\triangle ABC\)中,点\(D\)在边\(BC\)上,且\(BD=2CD\),\(\triangle ABD\)的面积记为\(S_{1}\),\(\triangle ADC\)的面积记为\(S_{2}.\)则\(S_{1}\)与\(S_{2}\)之间的数量关系为____________.
\((2)\)如图\(4\),在\(\triangle ABC\)中,点\(D\)、\(E\)分别在边\(AB\)、\(AC\)上,连接\(BE\)、\(CD\)交于点\(O\),且\(BO=2EO\),\(CO=DO\),若\(\triangle BOC\)的面积为\(3\),则四边形\(ADOE\)的面积为__________.