How to determine the sign of the sum when two rational numbers are added? How to determine the absolute value of the sum? How much is the sum when a rational number is added to 0?

How to determine the sign of the sum when two rational numbers are added? How to determine the absolute value of the sum? How much is the sum when a rational number is added to 0?

The same sign takes the same sign, and the different sign takes the sign with larger absolute value
Absolute values of the same sign are added and absolute values of different signs are subtracted
Rational number plus zero or primitive number

The sign of the sum is the same as that of the () addend, and the absolute value of the sum is equal to ()

The sign of the sum is the same as that of the addend, and the absolute value of the sum is equal to the absolute value of the large number minus the absolute value of the decimal

The absolute value of a positive number and zero is equal to itself?
Both positive and zero pairs are equal to themselves
Only the absolute value of a negative number is its opposite
The opposite absolute value of a number must be negative
How many of these three sentences are true?

The first sentence is right, followed by wrong
The absolute value of 0 is also the opposite
The opposite number of zero is zero

Given that a is the opposite of - 2012, B is the opposite of 7, and C is the number whose absolute value is equal to 3, find the value of a + B + C

a=-(-2012)=2012
b=-7
C = 3 or C = - 3
a+b+c=2012-7+3=2008
Or a + B + C = 2012-7-3 = 2002