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像科学家样思考(视版)

In the 17th, 18th, and 19th centuries, many mechanical calculators were developed, though with little success until the arrival of the arithmometer, a portable and reliable mechanical device that could add, subtract, multiply, and divide numbers.

17、18和19世纪,开发了很多机械计器,但四则计器到来之前几乎都没有成功,四则计器是携式且可靠的机械装置,可以对数字进行加、减、乘和除。

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