A vintage slide rule lies on the table among pieces of paper with examples of mathematical calculations. Retro device for mathematical calculations.
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当時はやる意味謎だった。大人になって気づいた「実は役立つ教科」1位は算数・数学
A vintage slide rule lies on the table among pieces of paper with examples of mathematical calculations. Retro device for mathematical calculations.
(1/3)
