高二向量的概念题a向量= -b向量是|a向量|=|b向量|的__________条件.我的思路:|a向量|=|b向量|,模长相等.那么a向量=b向量,或者a向量= -b向量.那么应该填必要非充分咯.但答案是充分非必要..我想知道
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![高二向量的概念题a向量= -b向量是|a向量|=|b向量|的__________条件.我的思路:|a向量|=|b向量|,模长相等.那么a向量=b向量,或者a向量= -b向量.那么应该填必要非充分咯.但答案是充分非必要..我想知道](/uploads/image/z/11450090-2-0.jpg?t=%E9%AB%98%E4%BA%8C%E5%90%91%E9%87%8F%E7%9A%84%E6%A6%82%E5%BF%B5%E9%A2%98a%E5%90%91%E9%87%8F%3D+-b%E5%90%91%E9%87%8F%E6%98%AF%7Ca%E5%90%91%E9%87%8F%7C%3D%7Cb%E5%90%91%E9%87%8F%7C%E7%9A%84__________%E6%9D%A1%E4%BB%B6.%E6%88%91%E7%9A%84%E6%80%9D%E8%B7%AF%3A%7Ca%E5%90%91%E9%87%8F%7C%3D%7Cb%E5%90%91%E9%87%8F%7C%2C%E6%A8%A1%E9%95%BF%E7%9B%B8%E7%AD%89.%E9%82%A3%E4%B9%88a%E5%90%91%E9%87%8F%3Db%E5%90%91%E9%87%8F%2C%E6%88%96%E8%80%85a%E5%90%91%E9%87%8F%3D+-b%E5%90%91%E9%87%8F.%E9%82%A3%E4%B9%88%E5%BA%94%E8%AF%A5%E5%A1%AB%E5%BF%85%E8%A6%81%E9%9D%9E%E5%85%85%E5%88%86%E5%92%AF.%E4%BD%86%E7%AD%94%E6%A1%88%E6%98%AF%E5%85%85%E5%88%86%E9%9D%9E%E5%BF%85%E8%A6%81..%E6%88%91%E6%83%B3%E7%9F%A5%E9%81%93)
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