在△ABC中,AB=AC,∠BAC=90°,D、E是BC上两点,且∠DAE=45°,求证:以BD、DE和EC为边可以构成一个直角三角形
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![在△ABC中,AB=AC,∠BAC=90°,D、E是BC上两点,且∠DAE=45°,求证:以BD、DE和EC为边可以构成一个直角三角形](/uploads/image/z/5338298-2-8.jpg?t=%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2C%E2%88%A0BAC%3D90%C2%B0%2CD%E3%80%81E%E6%98%AFBC%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E4%B8%94%E2%88%A0DAE%3D45%C2%B0%2C%E6%B1%82%E8%AF%81%3A%E4%BB%A5BD%E3%80%81DE%E5%92%8CEC%E4%B8%BA%E8%BE%B9%E5%8F%AF%E4%BB%A5%E6%9E%84%E6%88%90%E4%B8%80%E4%B8%AA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2)
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