This document is the user manual for fx-3650P and fx-3950P calculators, introduces the use of calculators, precautions and safety precautions.
This manual begins with safety precautions, warning users about battery handling, exposure to extreme temperatures, moisture, and physical impact. It stresses the importance of keeping batteries out of reach of children, never recharging or short‑circuiting them, and removing the battery if the calculator will not be used for an extended period.
The document then describes the calculator’s functions, including basic arithmetic, fraction, percentage, degree‑minute‑second, complex number, scientific, and programming operations. Key markings and color‑coded functions are explained to help users locate and use the appropriate keys quickly. This manual is written in Chinese.
| Battery replacement interval | At least every three years |
|---|
The battery should be replaced at least every three years, even if the calculator appears to work normally.
No. The battery must not be recharged, disassembled, or short‑circuited.
Seek immediate medical attention.