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In sequence T, each term after the first term is d more than the preceding term. The sum of the first 10 terms of T is 210. The sum of the first 20 terms of T is 820. What is the value of d?
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· 相关考点
6.2.1 等差数列
6.2.1 等差数列
以上解析由 考满分老师提供。
