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Calculators, anyone? My trusty FX-115s. Actually had to change the battery recently, after about 20 years of use. : r/casio
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FX-115ESPLUS Casio FX115ESPLUS - Calculadora científica (1 unidad), color negro : Amazon.es: Oficina y papelería
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FX-115ESPLUS Casio FX115ESPLUS - Calculadora científica (1 unidad), color negro : Amazon.es: Oficina y papelería
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