进行整式加减运算时，首先要去掉括号．去括号是整式加减运算的基础．如何正确去掉括号呢？请同学们注意以下几点：一、要注意括号前面的符号，会运用去括号法则：若括号前是“+”号，去括号后括号内各项都不变号；若括号前是“－”号，去掉括号后括号内各项都要改变符号．要防 When adding or subtracting integers, first remove the brackets. The parentheses are the basis for the addition and subtraction of integers. How to properly remove the brackets? Please pay attention to the following points: First, pay attention to the symbol in front of the parentheses, and use the bracketing rule: If the parenthesis is preceded by a “+” sign, all the items in the parentheses after the parentheses are not changed; if the parentheses are preceded by “- ”", after the brackets are removed, all the items in the brackets must be changed. To prevent