This is a user manual for fx-570MS/fx-991MS calculators. It mainly introduces the use of calculators, including calculation modes, basic operations, storage calculations, scientific function calculations, equation calculations, statistical calculations, matrix calculations, and vector calculations.
The guide provides step‑by‑step instructions for preparing the calculators, selecting calculation modes, and using basic arithmetic, complex numbers, statistics, matrix and vector operations. It also describes the SOLVE function, scientific functions, and how to enable engineering symbols.
Safety precautions, protective case handling, and technical specifications such as the dual‑line display and CALC storage limits are included to help users work efficiently and safely with the devices. This manual is written in Chinese.
| CALC storage capacity | Up to 79 steps per expression |
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The CALC storage can hold up to 79 steps for a single mathematical expression.
Press the designated key several times until the engineering symbol setting screen appears, then select the desired option.