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Which one is better, the Casio 991EX or the 991ES Plus? - Quora
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Which one is better, the Casio 991EX or the 991ES Plus? - Quora
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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 vs 991Es plus SPEED COMPARISON | is old one better ? - YouTube
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Amazon.com: מחשבון מדעי Casio FX-991ES Plus-2nd Edition : מוצרים למשרד
