已知Rt△ABC中,∠ACB=90º,BC=5,tan∠A= 3 4 .将△ABC绕点C逆时针旋转α(45°<α<135°)得已知Rt△ABC中,∠ACB=90º,BC=5,tan∠A= 3 4 .将△ABC绕点C逆时针旋转α(45°<α<135°)得到△DCE,
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![已知Rt△ABC中,∠ACB=90º,BC=5,tan∠A= 3 4 .将△ABC绕点C逆时针旋转α(45°<α<135°)得已知Rt△ABC中,∠ACB=90º,BC=5,tan∠A= 3 4 .将△ABC绕点C逆时针旋转α(45°<α<135°)得到△DCE,](/uploads/image/z/14914358-62-8.jpg?t=%E5%B7%B2%E7%9F%A5Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ACB%EF%BC%9D90%26%23186%3B%2CBC%EF%BC%9D5%2Ctan%E2%88%A0A%EF%BC%9D+3+4+%EF%BC%8E%E5%B0%86%E2%96%B3ABC%E7%BB%95%E7%82%B9C%E9%80%86%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%CE%B1%EF%BC%8845%C2%B0%EF%BC%9C%CE%B1%EF%BC%9C135%C2%B0%EF%BC%89%E5%BE%97%E5%B7%B2%E7%9F%A5Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ACB%EF%BC%9D90%26%23186%3B%2CBC%EF%BC%9D5%2Ctan%E2%88%A0A%EF%BC%9D+3+4+%EF%BC%8E%E5%B0%86%E2%96%B3ABC%E7%BB%95%E7%82%B9C%E9%80%86%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%CE%B1%EF%BC%8845%C2%B0%EF%BC%9C%CE%B1%EF%BC%9C135%C2%B0%EF%BC%89%E5%BE%97%E5%88%B0%E2%96%B3DCE%2C)
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