已知a,b是平面上两个不共线的非零向量,若a、1/2b、t(a+b)(t∈R)三向量的起点相同,则t为何值时,这三个向量的终点在同一直线上?我想知道为什么我这样做不对:∵这三个向量终点在同一直线上
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![已知a,b是平面上两个不共线的非零向量,若a、1/2b、t(a+b)(t∈R)三向量的起点相同,则t为何值时,这三个向量的终点在同一直线上?我想知道为什么我这样做不对:∵这三个向量终点在同一直线上](/uploads/image/z/5545029-21-9.jpg?t=%E5%B7%B2%E7%9F%A5a%2Cb%E6%98%AF%E5%B9%B3%E9%9D%A2%E4%B8%8A%E4%B8%A4%E4%B8%AA%E4%B8%8D%E5%85%B1%E7%BA%BF%E7%9A%84%E9%9D%9E%E9%9B%B6%E5%90%91%E9%87%8F%2C%E8%8B%A5a%E3%80%811%2F2b%E3%80%81t%28a%2Bb%29%28t%E2%88%88R%29%E4%B8%89%E5%90%91%E9%87%8F%E7%9A%84%E8%B5%B7%E7%82%B9%E7%9B%B8%E5%90%8C%2C%E5%88%99t%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E8%BF%99%E4%B8%89%E4%B8%AA%E5%90%91%E9%87%8F%E7%9A%84%E7%BB%88%E7%82%B9%E5%9C%A8%E5%90%8C%E4%B8%80%E7%9B%B4%E7%BA%BF%E4%B8%8A%3F%E6%88%91%E6%83%B3%E7%9F%A5%E9%81%93%E4%B8%BA%E4%BB%80%E4%B9%88%E6%88%91%E8%BF%99%E6%A0%B7%E5%81%9A%E4%B8%8D%E5%AF%B9%EF%BC%9A%E2%88%B5%E8%BF%99%E4%B8%89%E4%B8%AA%E5%90%91%E9%87%8F%E7%BB%88%E7%82%B9%E5%9C%A8%E5%90%8C%E4%B8%80%E7%9B%B4%E7%BA%BF%E4%B8%8A)
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