Is there a writing of 2 (2+2) in mathematics?

There is a writing of 2 (2+2) in mathematics, which means 2× (2+2).

2 (2+2) The 2 in front of the bracket means 2 times, but if the bracket is full of data, the multiple in front will generally be added with X. Only if there are unknowns in the bracket, such as X and Y, the multiplication sign will be omitted, but the writing of 2 (2+2) is also correct.

The rule of removing brackets is a mathematical rule. When the plus sign comes before the brackets, the brackets are removed and the formula in the brackets remains the same. When the minus sign comes before the parentheses, remove the parentheses, and the plus sign in the parentheses becomes a minus sign, and the minus sign becomes a plus sign.

Delete the symbol before the brackets together with the brackets.

It should be noted that when there is a "-"sign in front of the brackets, the symbols of the items in brackets will change after the brackets are removed. You can't just change the symbol of the first item or the first few items in brackets and forget to change other symbols.

If there is a numerical factor in front of the brackets, before removing the brackets, multiply the number with the items in brackets by multiplication and division to avoid mistakes.

When you encounter multiple brackets, you usually remove the brackets one by one from the inside out, or you can count the number of "-"from the outside in.

Extended data:

It must be noted that if there is a divisor before the parentheses, the divisor cannot be deleted directly.

example

Example 1. Remove the brackets first, and then merge similar items.

( 1)5a-(2a-4b).

2x2+3(2x-2).

Solution: (1) 5a-(2a-4b)

=5a-2a+4b

=3a+4b

(2)2x2+3(2x-2)

=2x2+6x-3x2

=-2+6 times