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|x|, the absolute value of x, is defined as follows:

|x| = x if x ≥ 0

|x| = -x if x < 0

The characteristics are:

|x| ≥ 0

|x| = 0 => x = 0

For any two numbers x and y,

|x*y| = |x|*|y|

|x+y| ≤ |x|+|y|

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Q: What are facts and characteristics of absolute value?
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