已知平面向量a,b(a不等于0,a不等于b)满足|b|=1,且a与b-a的夹角为120度,则|a|的取值范围是多少?复制的请自觉离开,
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![已知平面向量a,b(a不等于0,a不等于b)满足|b|=1,且a与b-a的夹角为120度,则|a|的取值范围是多少?复制的请自觉离开,](/uploads/image/z/4100746-58-6.jpg?t=%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E5%90%91%E9%87%8Fa%2Cb%28a%E4%B8%8D%E7%AD%89%E4%BA%8E0%2Ca%E4%B8%8D%E7%AD%89%E4%BA%8Eb%29%E6%BB%A1%E8%B6%B3%7Cb%7C%3D1%2C%E4%B8%94a%E4%B8%8Eb-a%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA120%E5%BA%A6%2C%E5%88%99%7Ca%7C%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E5%A4%8D%E5%88%B6%E7%9A%84%E8%AF%B7%E8%87%AA%E8%A7%89%E7%A6%BB%E5%BC%80%2C)
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