When there is a plus sign "+"in front of the bracket, when the bracket needs to be removed, the addition and subtraction signs in the bracket remain unchanged.

For example, 3+(3+3-5)=3+3+3-5.

2. The rule of removing brackets in subtraction.

When the symbol in front of the bracket is the minus sign "-",if the bracket is to be removed, the plus sign and minus sign in the bracket should be changed when the bracket is removed. That is, the plus sign "+"becomes the minus sign "-",and the minus sign "-"becomes the plus sign "+".

Such as 4-(4-3+2)=4-4+3-2.

Extended data:

Qu kuohao

1, when the plus sign is in front of the bracket, remove the bracket, and the formula in the bracket remains unchanged.

For example: 3+(6-4)=3+6-4

2. When there is a minus sign in front of the bracket, remove the bracket, and the plus sign in the bracket becomes a minus sign, and the minus sign becomes a plus sign.

For example: 4-(5-3+8)=4-5+3-8

3. When deleting brackets, the symbol before brackets should be deleted together with brackets.

4. At the same time, when the "-"comes before the bracket, all items in the bracket should change their symbols after the bracket is removed. You can't just change the symbol of the first item or the first few items in brackets and forget to change the rest of the symbols.

Baidu Encyclopedia-Rules for Removing Brackets