在梯形ABCD中,AB平行于CD,AB=a,CD=b,两腰延长线交于点M,过M作DC的平行线,交AC、BD延长线于E,E...在梯形ABCD中,AB平行于CD,AB=a,CD=b,两腰延长线交于点M,过M作DC的平行线,交AC、BD延长线于E,EF等于?
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![在梯形ABCD中,AB平行于CD,AB=a,CD=b,两腰延长线交于点M,过M作DC的平行线,交AC、BD延长线于E,E...在梯形ABCD中,AB平行于CD,AB=a,CD=b,两腰延长线交于点M,过M作DC的平行线,交AC、BD延长线于E,EF等于?](/uploads/image/z/7016117-5-7.jpg?t=%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%E5%B9%B3%E8%A1%8C%E4%BA%8ECD%2CAB%EF%BC%9Da%2CCD%EF%BC%9Db%2C%E4%B8%A4%E8%85%B0%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9M%2C%E8%BF%87M%E4%BD%9CDC%E7%9A%84%E5%B9%B3%E8%A1%8C%E7%BA%BF%2C%E4%BA%A4AC%E3%80%81BD%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EE%2CE...%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%E5%B9%B3%E8%A1%8C%E4%BA%8ECD%2CAB%EF%BC%9Da%2CCD%EF%BC%9Db%2C%E4%B8%A4%E8%85%B0%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9M%2C%E8%BF%87M%E4%BD%9CDC%E7%9A%84%E5%B9%B3%E8%A1%8C%E7%BA%BF%2C%E4%BA%A4AC%E3%80%81BD%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EE%2CEF%E7%AD%89%E4%BA%8E%3F)
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