如图所示,梯形ABCD中,AD‖BC,BD,AC交于O点,过O的直线分别交AB,CD于E,F,且EF‖BC AD=12厘米,BC=20厘米.求EF
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![如图所示,梯形ABCD中,AD‖BC,BD,AC交于O点,过O的直线分别交AB,CD于E,F,且EF‖BC AD=12厘米,BC=20厘米.求EF](/uploads/image/z/13353434-26-4.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%80%96BC%2CBD%2CAC%E4%BA%A4%E4%BA%8EO%E7%82%B9%2C%E8%BF%87O%E7%9A%84%E7%9B%B4%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4AB%2CCD%E4%BA%8EE%2CF%2C%E4%B8%94EF%E2%80%96BC+AD%3D12%E5%8E%98%E7%B1%B3%2CBC%3D20%E5%8E%98%E7%B1%B3.%E6%B1%82EF)
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