None of "these" expressions represent anything!
Yes, some expressions can be identical in value.
In C++ all false relational expressions have a mathematical value of 0.
They are callled: Identical equations or Identities See: http://www.tutorvista.com/search/value-algebraic-expressions
There are a few steps to rewriting expressions. The steps of rewriting expressions are finding the value of the letter and then using the common factor.
what mathematicians agreed on an so that numercial expressions would have only one value?
No, expressions cannot have the same value in algebra. They may be assigned to different values and on solving we can get different answers in each case.
no it is totally no !
They are identities.
An absolute-value function
The answer follows.
Both have a value
They are equivalent fractions.
When two expressions are equal to each other they form an equation.
There are many expressions that have this value. The simplest one is the number zero itself.
If both equations can be simplified to the same value, they are equal.
It means the distance from zero. | 22 | (the absolute value of 22) is 22; | -22 | (the absolute value of -22) is also 22. Basically just take out the negative, and that is the absolute value.
It is an equation
1(: if the variable is not given to you