一道高三向量题三角形ABC 因为 → → → |CB|=|AB+AC| ,所以可得三角形ABC是直角三角,且角A是直角怎么根据那个条件可以得出ABC是直角的?还强调了角A是直角
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![一道高三向量题三角形ABC 因为 → → → |CB|=|AB+AC| ,所以可得三角形ABC是直角三角,且角A是直角怎么根据那个条件可以得出ABC是直角的?还强调了角A是直角](/uploads/image/z/12499990-70-0.jpg?t=%E4%B8%80%E9%81%93%E9%AB%98%E4%B8%89%E5%90%91%E9%87%8F%E9%A2%98%E4%B8%89%E8%A7%92%E5%BD%A2ABC+%E5%9B%A0%E4%B8%BA+%E2%86%92+%E2%86%92+%E2%86%92+%7CCB%7C%3D%7CAB%2BAC%7C+%2C%E6%89%80%E4%BB%A5%E5%8F%AF%E5%BE%97%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E6%98%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%2C%E4%B8%94%E8%A7%92A%E6%98%AF%E7%9B%B4%E8%A7%92%E6%80%8E%E4%B9%88%E6%A0%B9%E6%8D%AE%E9%82%A3%E4%B8%AA%E6%9D%A1%E4%BB%B6%E5%8F%AF%E4%BB%A5%E5%BE%97%E5%87%BAABC%E6%98%AF%E7%9B%B4%E8%A7%92%E7%9A%84%3F%E8%BF%98%E5%BC%BA%E8%B0%83%E4%BA%86%E8%A7%92A%E6%98%AF%E7%9B%B4%E8%A7%92)
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