User manual Casio FX-991ES Plus (English - 46 pages)
International Chemistry Olympiad - IChO - For the competition purposes, all the competitors will be given a calculator Casio fx-991EX. The manual for the calculator can be downloaded from the following link:
fx-991EX-BU | CASIO
FX-991EX | Technical & scientific calculator | School and graphic calculators | Products | CASIO
Quick Start Guide (fx-991EX/fx570EX)_CASIO
Equation Solve for X – fx-991EX - Casio Calculator Tutorials - George Garside