关于梯形《北大绿卡》初二上,P45,第9题,在梯形ABCD中,AB平行于CD,过对角线AC的中点O作EF垂直AC,分别交边AB,CD与E,F,连接CE,AF.1,我做了·若EF=4,OE/OA=2/3,求四边形AECF的面积过程啊·····
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![关于梯形《北大绿卡》初二上,P45,第9题,在梯形ABCD中,AB平行于CD,过对角线AC的中点O作EF垂直AC,分别交边AB,CD与E,F,连接CE,AF.1,我做了·若EF=4,OE/OA=2/3,求四边形AECF的面积过程啊·····](/uploads/image/z/10770718-22-8.jpg?t=%E5%85%B3%E4%BA%8E%E6%A2%AF%E5%BD%A2%E3%80%8A%E5%8C%97%E5%A4%A7%E7%BB%BF%E5%8D%A1%E3%80%8B%E5%88%9D%E4%BA%8C%E4%B8%8A%2CP45%2C%E7%AC%AC9%E9%A2%98%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAB%E5%B9%B3%E8%A1%8C%E4%BA%8ECD%2C%E8%BF%87%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E7%9A%84%E4%B8%AD%E7%82%B9O%E4%BD%9CEF%E5%9E%82%E7%9B%B4AC%2C%E5%88%86%E5%88%AB%E4%BA%A4%E8%BE%B9AB%2CCD%E4%B8%8EE%2CF%2C%E8%BF%9E%E6%8E%A5CE%2CAF.1%2C%E6%88%91%E5%81%9A%E4%BA%86%C2%B7%E8%8B%A5EF%3D4%2COE%2FOA%3D2%2F3%2C%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2AECF%E7%9A%84%E9%9D%A2%E7%A7%AF%E8%BF%87%E7%A8%8B%E5%95%8A%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7)
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