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本单元的主要内容是实数的有关概念、性质和运算以及统计的初步知识．重点是有理数的概念和运算．难点是绝对值概念的理解和应用以及非负数的应用．（一）实效的概念与运算一、知识要点1．有理数整数和分数统称有理数．2．无理数无限不循环小数叫做无理数3．实数有理数和无理数
The main content of this module is the concept, nature and operation of real numbers and preliminary knowledge of statistics. The focus is on rational concepts and operations. The difficulty is the understanding and application of the concept of absolute value and the application of non-negative numbers. (1) Concept and operation of actual effect 1. Knowledge points 1. Rational numbers and fractions are collectively called rational numbers. 2. The irrational number of infinite loops is called an irrational number. Real numbers and irrational numbers