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1 h 48 min, 1 janv. 500 ans av. J.-C. - Abacus- a counting frame used by many countries before the Hindu and Arabic numeral system. Used For addition, subtraction and simple equations

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skurka class

Bytyler
20 oct. 2017
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642

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1 h 48 min, 1 janv. 500 ans av. J.-C.
Maintenaint
~ Il y a 2527 ans

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