Trachtenberg Speed System of Basic Mathematics, Paperback - Jakow Trachtenberg

Detalii:

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

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64.86 ^RON

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Vânzător: Elefant.ro
Brand: Profile Books Ltd