- A calculator
- B abacus
- C difference engine
- D analytical engine
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Answer:
A
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The earliest calculating device is abacus.
Abacus(1602)
Inventor: China
Characteristics:
- First mechanical calculating device.
- A horizontal rod represents the one, tens, hundred, etc.
Applications:
- Used for addition and subtraction operations.
- Calculation of square roots can also be performed.
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