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Casio FX-991ES PLUS - Calculadora científica (417 funciones, 15 + 10 + 2 dígitos, pantalla Natural), color gris : Amazon.es: Oficina y papelería
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Casio FX-991SP X vs Casio FX-991ES Plus | Bitácora de Javier Gutiérrez Chamorro (Guti)
Casio FX-991SP X vs Casio FX-991ES Plus | Bitácora de Javier Gutiérrez Chamorro (Guti)
