将三角形AOB绕AO的中点C(2,1)逆时针旋转九十度,得到三角形A'B'O',设O'B'交O'A于D,O'A'交x轴于点E,此接上,A',O'和B'的坐标分别为(1,3)(3,-1)(3,2),且O'B'经过B点,在旋转过程中,我
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![将三角形AOB绕AO的中点C(2,1)逆时针旋转九十度,得到三角形A'B'O',设O'B'交O'A于D,O'A'交x轴于点E,此接上,A',O'和B'的坐标分别为(1,3)(3,-1)(3,2),且O'B'经过B点,在旋转过程中,我](/uploads/image/z/14568553-1-3.jpg?t=%E5%B0%86%E4%B8%89%E8%A7%92%E5%BD%A2AOB%E7%BB%95AO%E7%9A%84%E4%B8%AD%E7%82%B9C%282%2C1%EF%BC%89%E9%80%86%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC%E4%B9%9D%E5%8D%81%E5%BA%A6%2C%E5%BE%97%E5%88%B0%E4%B8%89%E8%A7%92%E5%BD%A2A%27B%27O%27%2C%E8%AE%BEO%27B%27%E4%BA%A4O%27A%E4%BA%8ED%2CO%27A%27%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9E%2C%E6%AD%A4%E6%8E%A5%E4%B8%8A%2CA%26%2339%3B%2CO%26%2339%3B%E5%92%8CB%26%2339%3B%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BA%EF%BC%881%2C3%EF%BC%89%EF%BC%883%2C-1%EF%BC%89%EF%BC%883%2C2%EF%BC%89%2C%E4%B8%94O%26%2339%3BB%26%2339%3B%E7%BB%8F%E8%BF%87B%E7%82%B9%2C%E5%9C%A8%E6%97%8B%E8%BD%AC%E8%BF%87%E7%A8%8B%E4%B8%AD%2C%E6%88%91)
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