In Response To 'Re: build up a calculation program with variables'
If I go down to your first Min problem and do
In:= FullForm[0.047818 Min[25.0699, 19.71]
So it looks like you are getting your data from a packlet somewhere. If you just manually type in
and evaluate that it works just fine.
I think you need to figure out what the problem is with your packlet usage.