在等差数列{an}中,a16+a17+a18=a9=-36,其前n项和为Sn.(1)求Sn的最小值,并求出Sn取最小值n的值(2)求Tn=a1的绝对值+a2的绝对值+……+an的绝对值
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![在等差数列{an}中,a16+a17+a18=a9=-36,其前n项和为Sn.(1)求Sn的最小值,并求出Sn取最小值n的值(2)求Tn=a1的绝对值+a2的绝对值+……+an的绝对值](/uploads/image/z/3944159-71-9.jpg?t=%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E4%B8%AD%2Ca16%2Ba17%2Ba18%3Da9%3D-36%2C%E5%85%B6%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn.%EF%BC%881%EF%BC%89%E6%B1%82Sn%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E5%B9%B6%E6%B1%82%E5%87%BASn%E5%8F%96%E6%9C%80%E5%B0%8F%E5%80%BCn%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82Tn%3Da1%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%2Ba2%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%2B%E2%80%A6%E2%80%A6%2Ban%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC)
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