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Арифметика — RazumWiki
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Арифметика

Арифметика (греч. arithmetike, от arithmos - число), раздел математики, наука о числах, в первую очередь о натуральных (целых положительных) числах и действиях над ними.

Источник — https://my.razum.wiki/index.php?title=Арифметика&oldid=1279