问几何证明平行四边形题几道如图已知四边形ABCD中DE是角ADC的角平分线,交BC于点E。(1)求证:CD=CE (2) 求证:BE=CE 角B=80° 求角DAE的度数如图,平行四边形ABCD中,E, F是对角线BD上的点且BE=DF.
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![问几何证明平行四边形题几道如图已知四边形ABCD中DE是角ADC的角平分线,交BC于点E。(1)求证:CD=CE (2) 求证:BE=CE 角B=80° 求角DAE的度数如图,平行四边形ABCD中,E, F是对角线BD上的点且BE=DF.](/uploads/image/z/4493184-24-4.jpg?t=%E9%97%AE%E5%87%A0%E4%BD%95%E8%AF%81%E6%98%8E%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E9%A2%98%E5%87%A0%E9%81%93%E5%A6%82%E5%9B%BE%E5%B7%B2%E7%9F%A5%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%ADDE%E6%98%AF%E8%A7%92ADC%E7%9A%84%E8%A7%92%E5%B9%B3%E5%88%86%E7%BA%BF%EF%BC%8C%E4%BA%A4BC%E4%BA%8E%E7%82%B9E%E3%80%82%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ACD%3DCE++%282%29++%E6%B1%82%E8%AF%81%EF%BC%9ABE%3DCE++%E8%A7%92B%3D80%C2%B0++%E6%B1%82%E8%A7%92DAE%E7%9A%84%E5%BA%A6%E6%95%B0%E5%A6%82%E5%9B%BE%2C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CE%2C+F%E6%98%AF%E5%AF%B9%E8%A7%92%E7%BA%BFBD%E4%B8%8A%E7%9A%84%E7%82%B9%E4%B8%94BE%3DDF.)
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