平面向量.已知(a+b)垂直(2a-b),(a-2b)垂直(2a+b),试求a,b的夹角的余弦值.“麻...平面向量.已知(a+b)垂直(2a-b),(a-2b)垂直(2a+b),试求a,b的夹角的余弦值.“麻烦详细点”感激不尽!
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![平面向量.已知(a+b)垂直(2a-b),(a-2b)垂直(2a+b),试求a,b的夹角的余弦值.“麻...平面向量.已知(a+b)垂直(2a-b),(a-2b)垂直(2a+b),试求a,b的夹角的余弦值.“麻烦详细点”感激不尽!](/uploads/image/z/2771863-7-3.jpg?t=%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F.%E5%B7%B2%E7%9F%A5%28a%2Bb%29%E5%9E%82%E7%9B%B4%282a-b%29%2C%28a-2b%29%E5%9E%82%E7%9B%B4%282a%2Bb%29%2C%E8%AF%95%E6%B1%82a%2Cb%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC.%E2%80%9C%E9%BA%BB...%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8F.%E5%B7%B2%E7%9F%A5%28a%2Bb%29%E5%9E%82%E7%9B%B4%282a-b%29%2C%28a-2b%29%E5%9E%82%E7%9B%B4%282a%2Bb%29%2C%E8%AF%95%E6%B1%82a%2Cb%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC.%E2%80%9C%E9%BA%BB%E7%83%A6%E8%AF%A6%E7%BB%86%E7%82%B9%E2%80%9D%E6%84%9F%E6%BF%80%E4%B8%8D%E5%B0%BD%21)
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