著名数学家华罗庚指出:“善于‘退’,足够地‘退’,‘退’到最原始而不失重要的地方,是学好数学的一个诀窍.”又说:“先足够地退到我们最容易看清楚的地方,认透了,钻深了,然后再上去.”这就是以退为进的思想.这种思想也是我们解证数学问题的唯物辩证思想的一种体现. The famous mathematician Hua Luogeng pointed out: “To be good at ’retreat’, enough to ’retreat’, and ’to retreat’ to the most original but important place is to learn mathematics well.” Also said: “First enough to retreat To the place where we can see the most easily, we understand thoroughly, drill deeper, and then go up again.” This is the idea of ​​retreat. This kind of idea is also an embodiment of the materialist dialectical thought that we solved the problem of mathematics.