how to evaluate with certain conditions



I want to evaluate certain expressions by assuming that some variables have certain numeric values.

So -- this are more than one expression and more than one variable-value-pair.

How to can I avoid writing the variable-value pairs multiple times?


I was thinking of something like this:


values1:[a=1, b=2, c=3]$


ev(expr1, values1)$


ev(expr2, values1)$


ev(expr3, values1)$


Thanks

Peter