有关等差数列的题目,设一元二次方程(b-c)x2+(c-a)x+(a-b)=0有两个相等实根,求证:a,b,c为等差数列.(既是求证:b-a=c-b或2*1/b=1/a+1/c)我才新高一,,,培优题,,,大家不要这样,,,,
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![有关等差数列的题目,设一元二次方程(b-c)x2+(c-a)x+(a-b)=0有两个相等实根,求证:a,b,c为等差数列.(既是求证:b-a=c-b或2*1/b=1/a+1/c)我才新高一,,,培优题,,,大家不要这样,,,,](/uploads/image/z/12081717-45-7.jpg?t=%E6%9C%89%E5%85%B3%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E7%9A%84%E9%A2%98%E7%9B%AE%2C%E8%AE%BE%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%28b-c%29x2%2B%28c-a%29x%2B%28a-b%29%3D0%E6%9C%89%E4%B8%A4%E4%B8%AA%E7%9B%B8%E7%AD%89%E5%AE%9E%E6%A0%B9%2C%E6%B1%82%E8%AF%81%EF%BC%9Aa%2Cb%2Cc%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97.%28%E6%97%A2%E6%98%AF%E6%B1%82%E8%AF%81%EF%BC%9Ab-a%3Dc-b%E6%88%962%2A1%2Fb%3D1%2Fa%2B1%2Fc%29%E6%88%91%E6%89%8D%E6%96%B0%E9%AB%98%E4%B8%80%2C%2C%2C%E5%9F%B9%E4%BC%98%E9%A2%98%2C%2C%2C%E5%A4%A7%E5%AE%B6%E4%B8%8D%E8%A6%81%E8%BF%99%E6%A0%B7%2C%2C%2C%2C)
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