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统编教材数列一章有这样一个习题:某等差数列的前n项和公式是S_n=5n~2+3n,求它的前3项,并求它的通项公式(高中数学第四册第十四页)。
The series of textbooks compiled such an exercise: a series of arithmetic and n equals the difference is S_n = 5n ~ 2 + 3n, find its first three, and seek its general formula (fourth high school mathematics Page 14).