三角形,旋转,△ABC中∠C=90°∠A=30°∠ABC的平分线交AC于点D∠ADB绕点D旋转至∠A‘DB’当射线DA‘经过AB的一个三等分点时射线DB’交直线BC于点E则∠BED
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![三角形,旋转,△ABC中∠C=90°∠A=30°∠ABC的平分线交AC于点D∠ADB绕点D旋转至∠A‘DB’当射线DA‘经过AB的一个三等分点时射线DB’交直线BC于点E则∠BED](/uploads/image/z/7656600-48-0.jpg?t=%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E6%97%8B%E8%BD%AC%2C%E2%96%B3ABC%E4%B8%AD%26%2357353%3B%E2%88%A0C%3D90%C2%B0%26%2357353%3B%E2%88%A0A%3D30%C2%B0%26%2357353%3B%E2%88%A0ABC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%E4%BA%A4AC%E4%BA%8E%E7%82%B9D%26%2357353%3B%E2%88%A0ADB%E7%BB%95%E7%82%B9D%E6%97%8B%E8%BD%AC%E8%87%B3%E2%88%A0A%E2%80%98DB%E2%80%99%26%2357353%3B%E5%BD%93%E5%B0%84%E7%BA%BFDA%E2%80%98%E7%BB%8F%E8%BF%87AB%E7%9A%84%E4%B8%80%E4%B8%AA%E4%B8%89%E7%AD%89%E5%88%86%E7%82%B9%E6%97%B6%26%2357353%3B%E5%B0%84%E7%BA%BFDB%E2%80%99%E4%BA%A4%E7%9B%B4%E7%BA%BFBC%E4%BA%8E%E7%82%B9E%26%2357353%3B%E5%88%99%E2%88%A0BED)
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