如图,E为四边形的边AD上任一点,连接BE、CE,作AF//EC,交BC于点F,交BE于点M,连接DF,交CE于点N,连接MN,EF.(1)求证:OE=OF,OM=ON; (2)求证:四边形BFDE与四边形AECF均为平行四边形.如题
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![如图,E为四边形的边AD上任一点,连接BE、CE,作AF//EC,交BC于点F,交BE于点M,连接DF,交CE于点N,连接MN,EF.(1)求证:OE=OF,OM=ON; (2)求证:四边形BFDE与四边形AECF均为平行四边形.如题](/uploads/image/z/3238902-54-2.jpg?t=%E5%A6%82%E5%9B%BE%2CE%E4%B8%BA%E5%9B%9B%E8%BE%B9%E5%BD%A2%E7%9A%84%E8%BE%B9AD%E4%B8%8A%E4%BB%BB%E4%B8%80%E7%82%B9%2C%E8%BF%9E%E6%8E%A5BE%E3%80%81CE%2C%E4%BD%9CAF%2F%2FEC%2C%E4%BA%A4BC%E4%BA%8E%E7%82%B9F%2C%E4%BA%A4BE%E4%BA%8E%E7%82%B9M%2C%E8%BF%9E%E6%8E%A5DF%2C%E4%BA%A4CE%E4%BA%8E%E7%82%B9N%2C%E8%BF%9E%E6%8E%A5MN%2CEF.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AOE%3DOF%2COM%3DON%3B+%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2BFDE%E4%B8%8E%E5%9B%9B%E8%BE%B9%E5%BD%A2AECF%E5%9D%87%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2.%E5%A6%82%E9%A2%98)
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