What is the difference between a Casio FX-85GTX and FX-991EX? Does it matter for high school? - Quora
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Calculator scientific Casio fx-991ex classwiz with solar battery, non-programmable with 552 function integration
Casio FX991EX: ClassWiz FX-991EX Scientific Calculator – Icon Menu Display, Textbook Display, Slide-on Hard Case, Spreadsheet, Natural-VPAM – Solar, Battery Powered – 3" x 6.5" x 0.4" – 1 Each
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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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Amazon.com : CASIO FX-991EX Advanced Engineering/Scientific Calculator (UK Version), Black : Office Products
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