Absolute value is the distance from a point corresponding to a number on the exponential axis to the origin, which is represented by "||". |b-a| or |a-b| represents the distance between the point representing a and the point representing b on the number axis.
In mathematics, absolute value or modulus |? x？ | is non-negative, regardless of its sign, that is |x | = x means positive x, | x | = -x means negative x (in this case -x is positive), and | 0 | = 0. For example, the absolute value of 3 is 3, and the absolute value of -3 is also 3. The absolute value of a number can be considered as the distance from zero.
If you record three women as -3 and four men as +4, how many people are there? The calculation method is to add the absolute values of two numbers, that is, seven people. If you ask the difference between men and women, the calculation method is to add the relative numbers, which is+1.
If you take 1 km south as+1 and 2 km north as -2, then ask how many kilometers you have walked. The calculation method is to add the absolute values of two numbers, that is, 3km. If you are asked how many kilometers you have traveled, the calculation method is the sum of relative numbers, which is-1.
If 10 degree to zero degree is marked as+10, and minus 5 degree is marked as -5, how many degrees is the difference between up and down? The calculation method is to add the absolute values of two numbers, that is, 15 degrees. If you ask how many degrees the sum of temperatures is, the calculation method is to add the relative numbers, which is +5.