This is a calculator user manual, which introduces the basic functions, usage methods and precautions of the calculator.
This manual explains how to operate the Casio fx-3900Pv scientific calculator, describing each key function, program operations, and display behavior. It includes step‑by‑step instructions for turning the device on and off, performing arithmetic, statistical, and regression calculations, and using the built‑in programming features.
Safety precautions are detailed, advising users to avoid dropping, exposing the calculator to extreme temperatures, or using inappropriate cleaning agents. Battery information, power consumption, operating temperature range, dimensions, and weight are also listed for reference. This manual is written in Chinese.