Mathematical licking brackets

If you need to change the operation order, put parentheses;

If there is a plus sign or a multiplication sign in front of the brackets, the signs of the numbers in the brackets do not need to be changed;

If there is a minus sign or a division sign in front of the brackets, the number in the brackets is a plus sign, the minus sign becomes a plus sign, the multiplication sign becomes a division sign and the division becomes a multiplication sign.

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10 Is it urgent to change the number from two to one?