已知{a}为等差数列,其公差为-2,且a7是a3与a9的等比中项,Sn为{a}的前n项和,n属于正整数,则S10的值为
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![已知{a}为等差数列,其公差为-2,且a7是a3与a9的等比中项,Sn为{a}的前n项和,n属于正整数,则S10的值为](/uploads/image/z/1821525-69-5.jpg?t=%E5%B7%B2%E7%9F%A5%7Ba%7D%E4%B8%BA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%85%B6%E5%85%AC%E5%B7%AE%E4%B8%BA-2%2C%E4%B8%94a7%E6%98%AFa3%E4%B8%8Ea9%E7%9A%84%E7%AD%89%E6%AF%94%E4%B8%AD%E9%A1%B9%2CSn%E4%B8%BA%7Ba%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2Cn%E5%B1%9E%E4%BA%8E%E6%AD%A3%E6%95%B4%E6%95%B0%2C%E5%88%99S10%E7%9A%84%E5%80%BC%E4%B8%BA)
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