Casio FX-85GTPLUS-SB-UT Scientific Calculator (Old Model) replaced by the new FX-85GTX : Amazon.co.uk: Stationery & Office Supplies
Trial & Improvement using TABLE Mode on Casio - 5 Steps Method - Calculator fx-83GT fx-85GT PLUS - YouTube
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Casio FX-85GT Plus Scientific Calculator | GJQ125185J | Calculators