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Casio fx-991EX Review - Math Class Calculator
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
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Casio FX-991EX Classwiz Scientific Calculator 552 Function | eBay
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Casio FX-991EX Black Scientifc – ASA College: Florida
Eddie's Math and Calculator Blog: Comparison: Casio fx-991EX Classwiz Vs Sharp EL-W516T
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Casio FX-991EX Scientific Calculator with High-Resolution LCD
