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From: Albert Reiner <areiner@tph.tuwien.ac.at>
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Subject: Re: Evaluation of "standard" style math expresssions.
Date: 21 Sep 2004 14:10:15 +0200
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[Alex Polite <m4@polite.se>, 21 Sep 2004 11:48:13 GMT]:
> Hi there.
> 
> I know how to evaluate mathematical expressions expressed in lisp in
> any emacs buffer.  (eg (+ 17 42))
> 
> But I'd like to be able to eval expression where the notation is the
> kind you learn in school (eg (17 + 42))

M-x calc 1 7  + 4 2 RET; q to quit calc again.

Or if you have the maxima CAS <http://maxima.sourceforge.net/>
installed, you can simply use maxima-minor-mode or maxima-minibuffer
to do much more than adding numbers.  (Don't know whether this works
on windows.)

Albert.