有规律排列一列数:2,4,6,8,10,12,.它的每一项可用式子2n(n是正整数)来表示.现有一列有规律排列的数:1,-2,3,-4,5,-6,7,-8,.(1)对于它的每一项你认为可用怎样的式子来表示?(2)它的第100个数
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![有规律排列一列数:2,4,6,8,10,12,.它的每一项可用式子2n(n是正整数)来表示.现有一列有规律排列的数:1,-2,3,-4,5,-6,7,-8,.(1)对于它的每一项你认为可用怎样的式子来表示?(2)它的第100个数](/uploads/image/z/371974-22-4.jpg?t=%E6%9C%89%E8%A7%84%E5%BE%8B%E6%8E%92%E5%88%97%E4%B8%80%E5%88%97%E6%95%B0%EF%BC%9A2%2C4%2C6%2C8%2C10%2C12%2C.%E5%AE%83%E7%9A%84%E6%AF%8F%E4%B8%80%E9%A1%B9%E5%8F%AF%E7%94%A8%E5%BC%8F%E5%AD%902n%EF%BC%88n%E6%98%AF%E6%AD%A3%E6%95%B4%E6%95%B0%EF%BC%89%E6%9D%A5%E8%A1%A8%E7%A4%BA.%E7%8E%B0%E6%9C%89%E4%B8%80%E5%88%97%E6%9C%89%E8%A7%84%E5%BE%8B%E6%8E%92%E5%88%97%E7%9A%84%E6%95%B0%EF%BC%9A1%2C-2%2C3%2C-4%2C5%2C-6%2C7%2C-8%2C.%EF%BC%881%EF%BC%89%E5%AF%B9%E4%BA%8E%E5%AE%83%E7%9A%84%E6%AF%8F%E4%B8%80%E9%A1%B9%E4%BD%A0%E8%AE%A4%E4%B8%BA%E5%8F%AF%E7%94%A8%E6%80%8E%E6%A0%B7%E7%9A%84%E5%BC%8F%E5%AD%90%E6%9D%A5%E8%A1%A8%E7%A4%BA%3F%EF%BC%882%EF%BC%89%E5%AE%83%E7%9A%84%E7%AC%AC100%E4%B8%AA%E6%95%B0)
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