How to transfer symbolic expression to code? [closed]

I have a lot of messy things in Mathematica in a form like this:

Mathematica perfectly solves all these symbolic equations. But I'm in trouble when using Excel link with Mathematica. I really need to use Mathematica-defined symbolic formulas in Excel, so how can I transform from symbolic language to code?

closed as off-topic by user9660, MarcoB, RunnyKine, Yves Klett, m_goldbergMar 12 '16 at 13:47

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question cannot be answered without additional information. Questions on problems in code must describe the specific problem and include valid code to reproduce it. Any data used for programming examples should be embedded in the question or code to generate the (fake) data must be included." – Community, MarcoB, RunnyKine, Yves Klett, m_goldberg
If this question can be reworded to fit the rules in the help center, please edit the question.

• Talk is cheap. Ars longa, vita brevis. – Artes Mar 11 '16 at 19:08
• There is no difference between what you call symbolic language" and what you call "code" in Mathematica, so it is not clear what you are asking for. Could you elaborate on what you mean by "code"? – m_goldberg Mar 11 '16 at 20:27

You could also, in the long run, try to use the defined functions in Mathematica for the symbols to begin with. In my experience, this is a more robust method. For example, the you posted can be represented with the Sum function. Putting the symbols into Mathematica's Wolfram Documentation (available in the Help menu), will give you how Mathematica interprets these symbols. For example, searching the summation symbol yields the information at the following link: https://reference.wolfram.com/language/ref/character/Sum.html