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Calendars in widespread use today include the Gregorian calendar, which is the de facto international standard, and is used almost everywhere in the w 阅读全文
posted @ 2020-05-30 00:27
LiangYC1021
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In mathematics, the Pythagorean theorem — is a relation in Euclidean geometry among the three sides of a right-angled triangle. In terms of areas, it 阅读全文
posted @ 2020-05-30 00:22
LiangYC1021
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