延长线不等边△ABC的边BA到D,CA到E分别使AD=AB,AE=AC,则四边形BCDE是_________画出图形并证明.
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![延长线不等边△ABC的边BA到D,CA到E分别使AD=AB,AE=AC,则四边形BCDE是_________画出图形并证明.](/uploads/image/z/5342051-11-1.jpg?t=%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8D%E7%AD%89%E8%BE%B9%E2%96%B3ABC%E7%9A%84%E8%BE%B9BA%E5%88%B0D%2CCA%E5%88%B0E%E5%88%86%E5%88%AB%E4%BD%BFAD%3DAB%2CAE%3DAC%2C%E5%88%99%E5%9B%9B%E8%BE%B9%E5%BD%A2BCDE%E6%98%AF_________%E7%94%BB%E5%87%BA%E5%9B%BE%E5%BD%A2%E5%B9%B6%E8%AF%81%E6%98%8E.)
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