看，是一种没有写出来的假设．数学中的观察并不是简单的观看，而是有意识有目的地搜索信息和捕获规律．对于同一个问题，有人就能一眼看透，抓住其本质，很快找到解题的思路；而有人则对问题中明摆着的特殊性观而不见，一无所获．其根本的原因是观察的要领与观察的深度各... Look, it is an assumption that is not written out. The observation in mathematics is not simply watching, but consciously and purposefully searching for information and capturing laws. For the same question, some people can see through it, grasp its essence, and quickly find a way to solve the problem; while others have no idea of ​​the particularity of the problem, and they have nothing to gain. The fundamental reason is the depth of observation and the depth of observation.