Those are all closed-form solutions posted from QN, I believe. If you wanted to compute it quickly you could either do it numerically or use a symbolic engine (e.g. matlab) to back out a solution.
Take a look at The Complete Guide to Option Pricing Formulas http://www.amazon.com/Complete-Guid...dp/0071389970/ref=ed_oe_h/102-6586210-0500134 The code is shown in Excel VBA.