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Casio FX-991EX Engineering/Scientific Calculator, Black (European Version), 3" x 6.5" x 0.4": Amazon.co.uk: Stationery & Office Supplies
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Need help with my calculator! I have a Casio fx-CG50 but the equation solver on it is kind of wonky. It gives me the wrong answer, until I input another different equation
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Which one is better for engineering student, the Casio 991EX or the 991ES Plus or fx-991ES PLUS 2nd edition? - Quora
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