Short-cut math
Gerard W. Kelly
Clear, concise compendium of about 150 timesaving math short-cuts—faster, easier ways to add, subtract, multiply and divide. Each problem includes an explanation of the method, a step-by-step solution, the short-cut solution, and proof and an explanation of why it works. No special math ability needed.
Ссылка удалена правообладателем
----
The book removed at the request of the copyright holder.
