去括号是整式加减运算的重要内容 ,怎样学好去括号法并能运用 ,学习中应注意以下几点。1、去括号是恒等变形无论是去括号 ,还是添括号 ,其变化的仅仅是式子的结构形式和运算顺序 ,不能改变它的值 ,即去括号与添括号都是恒等变换。2、注意括号前是“ -”号的情况去括号时 ,如果 The brackets are an important part of the addition and subtraction of integers. How to learn the brackets and how to use them should be noted. The following points should be noted in the study. 1, to bracket is an isomorphic deformation whether it is to parentheses, or add parentheses, the change is only the structure of the formula and the order of operations, can not change its value, that is, the brackets and the parentheses are equal transformation. 2. Note that if the parentheses are preceded by a “-” sign, the parenthesis will be