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Addition, subtraction, multiplication, and division are binary operations.

加、减、算。

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countermoment, countermortar, countermove, countermovement, countermure, counteroffensive, counteroffer, counteropening, counterorder, counterpane,

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3G, 401(K), a,

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高等数学之美

A typical course starts with this very formal and abstract definition, which is that a group is a set – any collection of things – with a binary operation – a notion of multiplication between those things – such that this multiplication satisfies four special rules, or axioms.

典型的课程从式和抽象的定义开始,即群是一集合(任何事物的集合), 具有二元些事物之间的乘法概念), 使得种乘法满足四特殊规则或公理。

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counterpole, counterpose, counter-potential, counterpressure, counterproductive, counterprofile, counterprogram, counterprogramming, counterproof, counterpropaganda,

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3G, 401(K), a,
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