On the basis of middle school students' initial understanding of the geometric series and the concept of the series, through the analysis of specific examples, deepen the understanding of the concept of the geometric series, cultivate the students' dialectical thinking ability, and highlight the key points. For (4), focus on the analysis and emphasize the equal ratio. In the sequence, each term and the common ratio are not 0, and the common ratio is the ratio of the latter term to the former term.
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