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藤井斉亮・真島秀行ほか84名、新しい算数3下、p.4、2019年3月5日検定済、2021年7月10日発行、東京書籍、ISBN 978-4-487-11543-3 ^ [1] Symbol for the decimal marker (CR, 381 and Metrologia, 2004, 41, 104), Resolution