添括号是基础知识,也是初一代数学习的疑难点.在实际应用中,什么时候应添加括号呢? 1.由和或差的代数式标明单位时在列应用题的代数式时,若所列出的结果是几项的和或差的形式时,就需要添加括号, The parentheses are the basic knowledge, but also the difficulty of the first-generation learning. When should the parentheses be added in the actual application? 1. The algebraic equations that indicate the units when the units are listed in the column apply the algebraic equations. When the result is a few sums or bad forms, you need to add parentheses.