小学“代数初步知识”包括“用字母表示数”和“简易方程”两部分。由于这些知识是学习中学数学的重要基础,所以复习时不可掉以轻心。[要点精讲]1.切实掌握简写规则。为了使含有字母的式子看起来更简洁、更美观,数学作了这样的规定:数字与字母相乘,字母与字母相乘时,中间的乘号可以省略不写,或者写成小圆点。 Primary School “Algebra Preliminary Knowledge ” includes “with alphanumeric ” and “simple equation ” two parts. Since this knowledge is an important foundation for learning secondary mathematics, you should not be light-hearted when reviewing. [Points refinement] 1. To grasp the rules of shorthand. In order to make a formula containing letters look more concise, more beautiful, mathematics made the following rules: Numbers multiplied by letters, letters and letters multiplication, the middle multiplication can be omitted or not written, or written as dots.