锐角三角形ABC的三角A、B、C所对边的长分别为a、b、c,设向量m=(c-a,b-a),n=(a+b,c)且m∥n(1)求角B的大小;(2)若b=1,求a+c的取值范围.
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![锐角三角形ABC的三角A、B、C所对边的长分别为a、b、c,设向量m=(c-a,b-a),n=(a+b,c)且m∥n(1)求角B的大小;(2)若b=1,求a+c的取值范围.](/uploads/image/z/6831634-58-4.jpg?t=%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%89%E8%A7%92A%E3%80%81B%E3%80%81C%E6%89%80%E5%AF%B9%E8%BE%B9%E7%9A%84%E9%95%BF%E5%88%86%E5%88%AB%E4%B8%BAa%E3%80%81b%E3%80%81c%2C%E8%AE%BE%E5%90%91%E9%87%8Fm%3D%EF%BC%88c-a%2Cb-a%EF%BC%89%2Cn%3D%EF%BC%88a%2Bb%2Cc%EF%BC%89%E4%B8%94m%E2%88%A5n%EF%BC%881%EF%BC%89%E6%B1%82%E8%A7%92B%E7%9A%84%E5%A4%A7%E5%B0%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5b%3D1%2C%E6%B1%82a%2Bc%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.)
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