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CASIO Scientific Calculator fx-991MS Natural Textbook Display 240 FUNCTIONS Two-way power (Solar + Battery) Solar powered when light is sufficient, battery powered when light is insufficient. 2-LINE DISPLAY Multi-Replay Function Statistical Calculations with STAT-Data Editor Fraction Calculations Cálculos estadísticos con editor de datos STAT Cálculos fraccionarios The expression and its result can be displayed at the same time ¡La expresión y el resultado pueden visualizarse al mismo tiempo!