Don Rideout's article Arithmetic of Remainders in [2019: 45(3), p. 118 - 121]introduced a powerful problem solving tool { congruences. In this issue we revisitsome open problems from earlier columns and introduce a few more to get a feelfor congruences in action. All of these problems come from the course C&O 380that I took from Ross Honsberger eons ago when I was a student at the Universityof Waterloo.
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机译：Don Rideout在[2019：45（3），p。中的文章余数运算。 118-121]引入了功能强大的问题解决工具{congruences。在本期中，我们将回顾先前专栏中的一些未解决的问题，并介绍更多一些问题，以使大家感觉到行动上的一致性。所有这些问题都源于我在滑铁卢大学（University of Waterloo）读书时从罗斯·洪斯伯格（Ross Honsberger）选修的C＆O 380课程。
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