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Some interesting life phenomena can be solved by mathematics.
For example, when learning "circular decimal", we can think of such an example: once upon a time, there was a mountain and there was a temple on it. There is an old monk telling a story in the temple. What stories did he tell? Once upon a time, there was a mountain with a temple on it. Is it a well-known story of .................. that is very similar to cyclic decimals?

For another example, when learning the understanding of derivatives, we can think that some words in life can be said backwards: "I'll be right on the road"-"I'll be right on the road", and some words can be written backwards: "Stone"-"Gan", "Swallow"-"Wu" and "Dull". Are these phenomena similar to the penultimate number?

For another example, when learning the meaning and writing of percentage, we can think of some idioms that can also be used to express percentage: as sure as a gun-90%, as obedient as a gun-100%, as accurate as a gun-100%, as dubious as a gun-50%, one in a hundred- ...........................