What is the relationship between the sum of two rational numbers and the sign and absolute value of two addends Keep it simple. Don't copy

What is the relationship between the sum of two rational numbers and the sign and absolute value of two addends Keep it simple. Don't copy

When two rational numbers are added, the sign should be determined first, and then the absolute value should be calculated
Addition rule:
1. Add two numbers with the same sign, take the same sign, and add the absolute value
2. If the absolute value is not equal, add two numbers with different signs, take the sign of the addend with the larger absolute value, and subtract the smaller absolute value from the larger absolute value, which is the 0
3. If any number is added to 0, it still gets this number

In elementary school, the law of addition and exchange holds in the range of rational numbers. The sum of two rational numbers is only related to the sign and absolute value of the addend. (there is a supplement below)
In primary school, the law of addition and exchange holds in the range of rational numbers. The sum of two rational numbers is only related to the sign and absolute value of the addend, but has nothing to do with the position of the addend. When two numbers are added, the position of exchange () remains unchanged, that is: a + B + B + a
The law of combination of addition learned in primary school still holds in the range of rational numbers. To add three numbers, add () first, or add () first, and () remains unchanged, that is: a + B + C = (a + b) + C = a + (B + C).

The position of (and) remains unchanged
Add (the first two numbers), or add (the last two numbers) first, and (and) remain unchanged