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先看下面4道题,并请你从给出的这些具体的.特殊情况的信息出发,认真观察分析,归纳总结出用自然数n表示其一般规律的公式.
Let’s look at the following four questions first, and ask you to proceed from the information given in these specific and special situations, carefully observe and analyze, and summarize and formulate the formula that uses natural numbers n to represent its general laws.