Yes, a mathematical expression can have no variables, but such an expression is usually not very useful.
An example of a valid expression without variables is: 1+1=2
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It is a more complicated mathematical expression.
Yes. Expressions cannot be expressed without variables. There are numerical expressions for ex. 2 + 3 is an expression without variables.
its called an expression
multiterm mathematical expression: a mathematical expression consisting of the sum of a number of terms, each of which contains a constant and variables raised to a positive integral power
Is the value obtained when all the variables have been given their value and the expression has been calculated according to mathematical rules.