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我们可以在化归思想的指导下,灵活的对递推式进行变形,通过构造相关数列,将复杂问题简单化,将陌生的问题熟悉化.
We can flexibly reshape the recursive style under the guidance of the idea of returning to the origin, by constructing relevant sequences, simplifying complex problems, and familiarizing strange problems.