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去括号法则是初中数学基本技能之一，对后继学习有一定的影响作用．通过两年的跟踪调查，给出学习去括号法则所需时间，练习量，学生出错的类型、原因及纠正错误的方案．
The bracketing rule is one of the basic skills of junior high school mathematics and has a certain influence on subsequent learning. After two years of follow-up investigation, the time required for learning the bracket rule, the amount of exercises, the type of student error, the reason and the solution for correcting the error were given.