解一元一次方程时,同学们常常会遇到去括号这一步骤.为了避免因这一步出错而给完成解题带来麻烦,本文特提出几个值得注意的问题.一、注意括号前面的符号例1解方程2-(1-x)=-2.简析括号前为负号,去括号时必须将括号内各项的符号都改变.解去括号,得2-1+x=-2.移项、合并同类项,得x=-3. In order to solve the unary equation, students often encounter the bracketed step.In order to avoid the trouble caused by the error in this step to complete the problem solving, this article put forward a few notable problems: First, pay attention to the sign in front of the parenthesis Example 1 Solve the equation 2- (1-x) = - 2. Analyze the parentheses before the negative sign, the parentheses must be the brackets of the symbols are changed. Brackets, 2-1 + x = -2 To move items and merge similar items, get x = -3.