六年制重点中学高中数学课本《代数》第二册(试用本,以下简称新教材)第四章“行列式和线性方程组”,是在全日制十年制学校高中课本《数学》第三册(试用本,以下简称原教材)第一章“线性方程组”的基础上改写的。新教材这一章共分八节:1.二阶行列式和二元线性方程组;2.三阶行列式;3.三阶 The sixth chapter of the six-year key middle school high school mathematics textbook “Algebra” (trial version, hereinafter referred to as the new textbook) Chapter 4 “Determinants and Linear Equations” is the third in the full-time 10-year high school textbook “Mathematics” The book (trial version, hereinafter referred to as the original textbook) is rewritten on the basis of “Linear Equations” in Chapter One. The new textbook is divided into eight sections: 1. Second-order determinants and binary linear equations; 2. Three-order determinants; 3. Three-step