已知等差数列前m项和为a,前n项和为b,求前(m+n)项的和.
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![已知等差数列前m项和为a,前n项和为b,求前(m+n)项的和.](/uploads/image/z/14111092-28-2.jpg?t=%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E5%89%8Dm%E9%A1%B9%E5%92%8C%E4%B8%BAa%2C%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAb%2C%E6%B1%82%E5%89%8D%EF%BC%88m%2Bn%EF%BC%89%E9%A1%B9%E7%9A%84%E5%92%8C.)
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