Hello! I'll just talk about this problem. If there is a plus sign outside the brackets in this question, then there is still a plus sign inside the brackets. If there is a minus sign outside the brackets, the symbols in the brackets will change their signs after being deleted.

If there is a multiplication symbol outside the brackets, the symbol will remain unchanged after removing the brackets; If there is a division symbol outside the brackets, the numbers inside will change after the brackets are removed.

If there is a minus sign in front of the brackets, multiply each number in the brackets with the previous number (don't lose the minus sign); If there is a plus sign in front of the bracket, just calculate the number in the bracket and copy it directly. I hope the answer can be adopted by you!