18.如图18,△ABC中,点O是AC边上一动点,过点O作MN//BC,交∠BCA的平分线于E,交∠BCA的外角平分线于F.（1）证明：EO=FO；（2）猜想当点O运动到何处时,四边形AECF是矩形?并说明你的理由.19.在平行四边
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