The three basic properties of Yang Hui triangle are mainly binomial coefficient of binomial expansion, that is, the property of combination number, which is the basis for studying other laws of Yang Hui triangle. The numerical law of Yang Hui's triangle intersection mainly includes the relationship between intersection numbers. Combinatorial relation and the connection between different transverse numbers.

And such triangles are often used in our Olympic Games. The simplest thing is to find a pattern.

Simply put, it is the coefficient problem after the power operation of the sum of two unknowns, such as the square of (x+y) = the square of x+2xy+y, so the coefficient is 1, 2, 1, which is a line in Yang Hui's triangle, cubic and quartic. Look at the coefficient of each term and you will understand the reason. ?

This is Yang Hui Triangle, also called Jia Xian Triangle, and Pascal Triangle abroad.

Okay, let me explain something to you. Yang Hui Triangle should belong to high school knowledge, but it is mostly used in primary schools and junior high schools. It is rarely used unless you are engaged in mathematical research. You can't buy cheap food by drawing a Yang Hui triangle for the grocer. After high school, mathematics has little connection with life, and mainly plays the role of exercising thinking. (absolutely original! ! )