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Why is there a difference in calculator outputs for [math]6/2(2+1)[/math] done with CASIO scientific calculator vs mobile calculator/scientific calculator? - Quora
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Casio fx-39 - Scientific calculator from 1978 - YouTube
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Casio fx-39 Scientific calculator 1978 Japan - Vintage Man Stuff
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Virtual Museum of Calculators
Vintage Retro 1970s Casio Scientific Calculator Fx-39 Made in Japan for sale online | eBay