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数列是高中数学的重点内容之一,由于在测试学生逻辑推理能力和理性思维水平方面有不可替代的作用,所以在历年高考题中占有较大比重。数列求和的常见方法归纳如下:一、公式法直接利用等差数列、等比数列的前n项和公式求和。(1)等差数列的前n项和公式:
The number sequence is one of the key contents of high school mathematics. Due to its irreplaceable role in testing students’ logical reasoning ability and rational thinking level, the number occupies a large proportion in the college entrance examination years. The common method of summation of sequence is summarized as follows: First, the formula method directly uses the arithmetic sequence, the first n of the geometric sequence and the formula summation. (1) The first n terms and equations of arithmetic progression: