What is the difference between a Casio FX-85GTX and FX-991EX? Does it matter for high school? - Quora
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Amazon.com : Casio FX-991ES Plus Scientific Calculator Fx 991 Es - New & Sealed ship to world wide : Office Products
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Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
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