高二数学几何证明题!急急急在三角形abc中,三条边a,b,c所对的角分别为A,B,C,且a,b,c成等比数列,A,B,C成等差数列,证明三角形ABC是正三角形
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![高二数学几何证明题!急急急在三角形abc中,三条边a,b,c所对的角分别为A,B,C,且a,b,c成等比数列,A,B,C成等差数列,证明三角形ABC是正三角形](/uploads/image/z/15212299-67-9.jpg?t=%E9%AB%98%E4%BA%8C%E6%95%B0%E5%AD%A6%E5%87%A0%E4%BD%95%E8%AF%81%E6%98%8E%E9%A2%98%21%E6%80%A5%E6%80%A5%E6%80%A5%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2abc%E4%B8%AD%2C%E4%B8%89%E6%9D%A1%E8%BE%B9a%2Cb%2Cc%E6%89%80%E5%AF%B9%E7%9A%84%E8%A7%92%E5%88%86%E5%88%AB%E4%B8%BAA%2CB%2CC%2C%E4%B8%94a%2Cb%2Cc%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2CA%2CB%2CC%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E8%AF%81%E6%98%8E%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E6%98%AF%E6%AD%A3%E4%B8%89%E8%A7%92%E5%BD%A2)
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