翻訳と辞書 Words near each other ・ Timeline of punk rock ・ Timeline of Puri ・ Timeline of Norfolk, Virginia ・ Timeline of Norse colonization of the Americas ・ Timeline of Nortel ・ Timeline of North American automobiles ・ Timeline of North Omaha, Nebraska history ・ Timeline of Northfield, Minnesota ・ Timeline of Northumbria and Northumberland ・ Timeline of Norwich ・ Timeline of Nottingham ・ Timeline of Novosibirsk ・ Timeline of nuclear fusion ・ Timeline of nuclear weapons development ・ Timeline of number theory ・ Timeline of numerals and arithmetic ・ Timeline of numerical analysis after 1945 ・ Timeline of Nuremberg ・ Timeline of nursing history ・ Timeline of nursing history in Australia and New Zealand ・ Timeline of Oakland, California ・ Timeline of Occupy Oakland ・ Timeline of Occupy Wall Street ・ Timeline of Odessa ・ Timeline of official adoptions of Christianity ・ Timeline of official languages policy in Canada ・ Timeline of Oklahoma City ・ Timeline of Olympus creative digital cameras ・ Timeline of Omaha, Nebraska history ・ Timeline of Omsk Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Timeline of numerals and arithmetic ： ウィキペディア英語版 Timeline of numerals and arithmetic A timeline of numerals and arithmetic == Before 2000 BC == * c. 20,000 BC — Nile Valley, Ishango Bone: suggested as the earliest reference to prime numbers and Egyptian multiplication although this is disputed. * c. 3400 BC — the Sumerians invent the first numeral system, and a system of weights and measures. * c. 3100 BC — Egypt, earliest known decimal system allows indefinite counting by way of introducing new symbols, (). * c. 2800 BC — Indus Valley Civilization on the Indian subcontinent, earliest use of decimal ratios in a uniform system of ancient weights and measures, the smallest unit of measurement used is 1.704 millimetres and the smallest unit of mass used is 28 grams. * c. 2000 BC — Mesopotamia, the Babylonians use a base-60 decimal system, and compute the first known approximate value of π at 3.125. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timeline of numerals and arithmetic」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.