一块长方形的钢板abcd的两边ab、cd平行.要在ab上找一点e,使角aec=1∠AEC=150°,所以∠BEC=30°,哪如何求证∠ECD要等于30°.
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![一块长方形的钢板abcd的两边ab、cd平行.要在ab上找一点e,使角aec=1∠AEC=150°,所以∠BEC=30°,哪如何求证∠ECD要等于30°.](/uploads/image/z/8027490-66-0.jpg?t=%E4%B8%80%E5%9D%97%E9%95%BF%E6%96%B9%E5%BD%A2%E7%9A%84%E9%92%A2%E6%9D%BFabcd%E7%9A%84%E4%B8%A4%E8%BE%B9ab%E3%80%81cd%E5%B9%B3%E8%A1%8C.%E8%A6%81%E5%9C%A8ab%E4%B8%8A%E6%89%BE%E4%B8%80%E7%82%B9e%2C%E4%BD%BF%E8%A7%92aec%3D1%E2%88%A0AEC%3D150%C2%B0%2C%E6%89%80%E4%BB%A5%E2%88%A0BEC%3D30%C2%B0%2C%E5%93%AA%E5%A6%82%E4%BD%95%E6%B1%82%E8%AF%81%E2%88%A0ECD%E8%A6%81%E7%AD%89%E4%BA%8E30%C2%B0.)
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