Thank you all! :)
One more simple question:
How can I do something like the "apart" operation in Mathematica?
(C1) a/c+b/d;
b a
(D1) - + -
d C
(C2) rat(%);
a d + b C
(D2)/R/ ---------
C d
Now given the form like [D2], how can I get something like D1?
I'm not good at Mathematics but I'm drawing a lot of people in my unversity to MAXIMA. Formerly they don't even know this wonderful tool. They use Mathematica a lot.
They'll ask me a lot of questions like "How to do ... like that in Mathematica in MAXIMA?" I sometimes don't know. So I post the questions here. I wish you could help.
Thanks.
--
Wang Yin
DA Lab, Tsinghua University,
100084
Beijing China