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Explore Logic Gate on Classwiz | Casio fx-991EX Classwiz -- the best Calculator for School/Cllege level... Learn to do Maths on it. | By Casio Calculators Bangladesh | Facebook
How to Reset a Casio FX-991EX or FX-570EX CLASSWIZ Calculator - YouTube
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Casio fx-991ES Plus giving me weird results, is it faulty or can there be a setting I'm missing? : r/calculators
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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
Memory Reset on Casio Classwiz fx-991EX Classwiz - YouTube