In the seventh grade mathematics curriculum, the rule of removing brackets is an important concept that students need to master. The rule of removing brackets mainly involves how to remove brackets when there is a plus sign in front of brackets and how to remove brackets when there is a minus sign in front of brackets.

First of all, when there is a plus sign in front of the bracket, we call it a plus sign bracket. When the plus sign in brackets is removed, all items in brackets remain unchanged, and brackets can be removed directly. For example, (a+b) is still a+b after removing the brackets.

Then, when there is a minus sign in front of the brackets, we call it a minus sign. When the minus sign is removed from the brackets, all items in the brackets will change sign, even-numbered items will become opposite signs, and odd-numbered items will become the same sign. For example, (a-b) becomes a-(-b) after removing the brackets, that is, A+B.

This law is widely used in mathematics. For example, in algebraic operation, equation solving, function analysis and other occasions, we all need to use the rule of brackets. By mastering the rules of removing brackets, students can better understand the basic concepts in mathematics and improve their problem-solving ability and mathematical literacy.

In addition to the basic rules for removing brackets, there are some extended rules for removing brackets. For example, when there is a multiplication symbol in front of the bracket, after the bracket is removed, everything in the bracket is multiplied by the number in front of the bracket. When there is a division symbol in front of the bracket, everything in the bracket should be divided by the number in front of the bracket when the bracket is removed. These extension rules are based on the basic bracket removal rules.

The rule of removing brackets is a very important concept in the seventh grade mathematics curriculum. Students need to understand this law carefully and master it skillfully in order to calculate and reason correctly when solving mathematical problems. At the same time, through the study and practice of removing brackets, students can also cultivate their mathematical thinking ability and logical reasoning ability, and improve their mathematical literacy and comprehensive quality.

In a word, the rule of removing brackets in grade seven is an important concept that students need to master, which involves the addition, subtraction, multiplication and division of brackets. By studying and practicing the rule of removing brackets, students can better understand the basic concepts in mathematics, improve their problem-solving ability and mathematical literacy, and cultivate their mathematical thinking ability and logical reasoning ability.