一、把握“初步”尺度，突出“双基”本节教材包括三项内容：用字母表示数、简易方程及比和比例。用字母表示数的整理和复习，重点是掌握用字母表示数、数量关系、运算定律和计算公式；掌握用字母表示同分母分数相加的法则；掌握求几个相同字母（表示数）相加的和的乘式写... First, grasp the “preliminary” scale, highlighting “double base” This section consists of three teaching materials: the number of letters, simple equations and ratio and ratio. The use of letters that the number of finishing and review, the key is to master the use of letters that number, the relationship between the number, the law of the law and the formula; master with the letter denoting the law with the denominator; master seeking a few identical letters Multiplication of the sum ...