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同学们知道杨辉三角吗?看看蒋老师怎么介绍吧.同学们,请仔细观察一下图1,你觉得它像什么图形?对了,它像一个用数组成的等腰三角形.你能发现这些数之间的规律吗?其实,最本质的特征是,数1在两条腰上,而其余的数则等于其“肩”上的两个数之和,如第六层的第二个数5,就等于其“肩”上的两个数1、4的和.这个三角我们叫杨辉三角,它出现在我国南宋数学家杨辉编著的《详解九章算法》一书中,杨辉指出这个方法出于《释锁算术》.在欧洲,这个三角被认为是法国数学家、物
Did the students know Yang Hui Triangle? Let’s see how Teacher Jiang introduced it. Students, please take a closer look at Figure 1. What do you think it looks like? Yes, it looks like an isosceles triangle with numbers. You can find these In fact, the most essential feature is that the number 1 is on the two waists, and the rest is equal to the sum of the two numbers on its shoulders, such as the second on the sixth floor. The number 5 is equal to the sum of the two numbers 1 and 4 on its shoulder. This triangle is called the Yang Hui triangle. It appears in the book “Detailed Solution to the Nine Chapters” written by the Southern Song mathematician Yang Hui. Yang Hui pointed out that this method is based on “Release lock arithmetic.” In Europe, this triangle is considered to be a French mathematician and object.