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来自「实用的离散数学课件」· HTM 代码 · 共 20 行

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    <td  >&nbsp; 本节主要介绍<a href="content-5-5-1.htm#content-5-5-1-eryuanyunsuan">二元运算</a>以及几个特殊的元素<a href="content-5-5-2.htm#content-5-5-2-danweiyuan">单位元</a>、<a href="content-5-5-3.htm#content-5-5-3-lingyuan">零元</a>以及<a href="content-5-5-4.htm#content-5-5-4-niyuan">逆元</a>。</td>
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