谈一个似是而非的“等式”黄伟（湖南税务高等专科学校４１０１１６）某种产品，记单位产品纳税前的价格为Ａ，税收为Ｂ，纳税后的价格为Ｗ，许多人认为应有等式Ａ＋Ｂ＝Ｗ．这是普通流行的一种错误观念．本文运用经济数学知识说明这一点，同时为数学应用题的编拟提供一点... Talk about a plausible “equivalence” Huang Wei (Hunan Taxation College 410116) A certain product, the price of the pre-tax payment is A, the tax is B, and the price after tax is W. Many people think that there should be an equation. A+B=W. This is a common misconception. This article uses economic mathematics to illustrate this point, and at the same time provides a point for the preparation of mathematical problems...