如图,在直角三角形abcd中,ad平行bc,角a等于90度,角dcb等于75,以cd为一边的等边三角形dec点e在腰ab上求证;df等于fc修改下后边,以cd为边三角形dec的另一顶点e在腰ab上,前面是直角梯形
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![如图,在直角三角形abcd中,ad平行bc,角a等于90度,角dcb等于75,以cd为一边的等边三角形dec点e在腰ab上求证;df等于fc修改下后边,以cd为边三角形dec的另一顶点e在腰ab上,前面是直角梯形](/uploads/image/z/12540941-53-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2abcd%E4%B8%AD%2Cad%E5%B9%B3%E8%A1%8Cbc%2C%E8%A7%92a%E7%AD%89%E4%BA%8E90%E5%BA%A6%2C%E8%A7%92dcb%E7%AD%89%E4%BA%8E75%2C%E4%BB%A5cd%E4%B8%BA%E4%B8%80%E8%BE%B9%E7%9A%84%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2dec%E7%82%B9e%E5%9C%A8%E8%85%B0ab%E4%B8%8A%E6%B1%82%E8%AF%81%EF%BC%9Bdf%E7%AD%89%E4%BA%8Efc%E4%BF%AE%E6%94%B9%E4%B8%8B%E5%90%8E%E8%BE%B9%EF%BC%8C%E4%BB%A5cd%E4%B8%BA%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2dec%E7%9A%84%E5%8F%A6%E4%B8%80%E9%A1%B6%E7%82%B9e%E5%9C%A8%E8%85%B0ab%E4%B8%8A%2C%E5%89%8D%E9%9D%A2%E6%98%AF%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2)
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