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Why does the German version of the Casio fx-991EX, the fx-991DE X, have more functions than the US version? : r/calculators
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How fast is Casio FX-991EX ClassWiz as compared to other scientific non-programmable calculators? - Quora
Which scientific calculator is better for mechanical engineers, a Casio FX-991ES, a Texas instruments TI-36 X or a Casio FX115 ES? - Quora
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