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CASIO-calculadora científica avanzada FX-991EX, dispositivo Original con 552 funciones, para estudiantes de ingeniería, laboratorio de secundaria, oficina, batería Solar - AliExpress
Casio fx-87DE PLUS CAS calculator Black Display (digits): 12 solar-powered, battery-powered (W x H x D) 80 x 11 x 161 mm | Conrad.com