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My FX-991EX seems to be stuck. It's not taking any inputs and not responding to reset button. : r/calculators
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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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Found this incredible function on my Fx991EX if you press shift and Option button on left corner it creates a QR code that can be scanned with a phone to see graphing
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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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Eddie's Math and Calculator Blog: Casio fx-991EX Classwiz Review
