我曾经就“为什么要学数学”这个问题到一些中学进行过调查.在南京市营养学校,同学们围着我七嘴八舌: “老师,我们以后都是站白案、掌红锅的,学那么多数学有什么用?”“胡长龄是江苏特一级厨师,他也没学过根与系数的关系和勾股定理!” I once went to some secondary schools on the question “Why should I study mathematics?” At the Nanjing Nutrition School, the students gathered around me and said, “Teacher, we are all standing behind the table and holding hands. What is the use of learning so much mathematics?” “Hu Changling is a special-level chef in Jiangsu Province. He has never learned the relationship between roots and coefficients and the Pythagorean theorem!”