等腰梯形ABCD中,AD平行BC,AB等于DC,AC垂直BD,过D点作DE平行AC交BC的延长线于点E(1)求证四边形ACED是平行四边形 (2)若AD等于3,BC等于7,求梯形ABCD面积
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![等腰梯形ABCD中,AD平行BC,AB等于DC,AC垂直BD,过D点作DE平行AC交BC的延长线于点E(1)求证四边形ACED是平行四边形 (2)若AD等于3,BC等于7,求梯形ABCD面积](/uploads/image/z/7845215-23-5.jpg?t=%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E5%B9%B3%E8%A1%8CBC%2CAB%E7%AD%89%E4%BA%8EDC%2CAC%E5%9E%82%E7%9B%B4BD%2C%E8%BF%87D%E7%82%B9%E4%BD%9CDE%E5%B9%B3%E8%A1%8CAC%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%281%29%E6%B1%82%E8%AF%81%E5%9B%9B%E8%BE%B9%E5%BD%A2ACED%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2+%EF%BC%882%EF%BC%89%E8%8B%A5AD%E7%AD%89%E4%BA%8E3%2CBC%E7%AD%89%E4%BA%8E7%2C%E6%B1%82%E6%A2%AF%E5%BD%A2ABCD%E9%9D%A2%E7%A7%AF)
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