Více o knize
First developed during WW2, the Trachtenberg speed system makes possible high-speed arithmetical calcula tions with a remarkable degree of accuracy. The system has e ven been known to beat computer calculations - in some insta nces - in terms of speed '
Nákup knihy
The Trachtenberg speed system of basic mathematics translated and adapted by Ann Cutler and Rudolph McShane, Ann Cutler, Rudolph McShane
- Jazyk
- Rok vydání
- 1962
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- (pevná)
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Doručení
Platební metody
Nikdo zatím neohodnotil.