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九年制义务教育三年制教材代数第二册最后一章安排了“二次根式”,笔者以为要学好本章必须明确以下几个问题. 1.二次根式一章中,如果没有特别说明,所有字母都表示正数
The last chapter of the second edition of the second-year textbook of the three-year compulsory education system for the nine-year compulsory education arranges the “secondary root style”. The author thinks that we must clarify the following issues in order to learn the chapter well. 1. In the chapter of secondary roots, if there is no special explanation, All letters are positive