- Trachtenberg Technique v2
- Android App: Libri e consultazione di: Developers Never Dies
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- Listes: 0 + 0 Classificazioni: 0 Recensioni: 0
- Punti: 0 + 0 Versione: 7.0 The Trachtenberg system v2 is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations ... ⥯
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