对于含有多层括号的整式加减运算,要根据算式的特点,采取灵活的方法,目的是尽可能减少去括号的次数和变号的项数.一般来说,这类问题要注意两点:一要按照去括号的顺序,二要注意符号法则.但是,有一些题目可以打破常规思路,采取一些灵活的解题方法,使运算过程更简捷.一、去括号法则与添括号法则掌握去括号法则的关键是要把括号及其前面的符号视为一个整体 For integer additions and subtractions that include multiple layers of parentheses, a flexible approach should be taken based on the characteristics of the equations. The goal is to minimize the number of parentheses and variable number of entries. In general, there are two things to pay attention to: First, according to the order of parentheses, the second is to pay attention to the rule of symbols. However, there are some problems that can break the conventional thinking and adopt some flexible solution methods to make the calculation process more simple. First, the parentheses rule and the parentheses rule to grasp the parentheses. The key to the law is to treat the brackets and the symbols in front of them as a whole.