备考辅导：新GRE数学要点指导
<p> 为了方便广大考生更好的复习，综合整理了新<span word="GRE">GRE</span>数学的要点指导：交集和并集，以供各位考生考试复习参考,希望对考生复习有所帮助。愿大家都能取得好成绩，更多有关留学考试的资讯与辅导资料敬请关注留学考试。</p><p> <span word="Intersection">Intersection</span> <span word="of">of</span> <span word="Sets">Sets</span></p><p> <span word="Intersection">Intersection</span> <span word="of">of</span> <span word="two">two</span> <span word="sets">sets</span> <span word="is">is</span> <span word="another">another</span> <span word="set">set</span> <span word="with">with</span> <span word="only">only</span> <span word="the">the</span> <span word="members">members</span> <span word="that">that</span> <span word="are">are</span> <span word="in">in</span> <span word="both">both</span> <span word="sets">sets</span>. <span word="If">If</span> <span word="the">the</span> <span word="two">two</span> <span word="sets">sets</span> <span word="do">do</span> <span word="not">not</span> <span word="share">share</span> <span word="any">any</span> <span word="common">common</span> <span word="member">member</span>， <span word="the">the</span> <span word="intersection">intersection</span> <span word="is">is</span> <span word="the">the</span> <span word="empty">empty</span> <span word="set">set</span> <span word="with">with</span> <span word="no">no</span> <span word="member">member</span>.</p><p> <span word="Example">Example</span>：</p><p> <span word="Intersection">Intersection</span> <span word="of">of</span> {1，2，3} <span word="and">and</span> {2，3，5} <span word="is">is</span> <span word="the">the</span> <span word="set">set</span> {2，3}。</p><p> <span word="Intersection">Intersection</span> <span word="of">of</span> <span word="the">the</span> <span word="set">set</span> <span word="with">with</span> <span word="all">all</span> <span word="primes">primes</span> <span word="and">and</span> <span word="the">the</span> <span word="set">set</span> <span word="with">with</span> <span word="all">all</span> <span word="even">even</span> <span word="numbers">numbers</span> <span word="is">is</span> <span word="the">the</span> <span word="set">set</span> {2} <span word="since">since</span> <span word="only">only</span> 2 <span word="is">is</span> <span word="both">both</span> <span word="even">even</span> <span word="and">and</span> <span word="prime">prime</span>.</p><p> <span word="Intersection">Intersection</span> <span word="of">of</span> {1，2，3} <span word="and">and</span> {4，5，6} <span word="is">is</span> <span word="the">the</span> <span word="empty">empty</span> <span word="set">set</span> {}。</p><p> <span word="Remember">Remember</span>：</p><p> <span word="Intersection">Intersection</span> <span word="contains">contains</span> <span word="only">only</span> <span word="the">the</span> <span word="common">common</span> <span word="members">members</span>.</p><p> <span word="Two">Two</span> <span word="sets">sets</span> <span word="are">are</span> <span word="disjoint">disjoint</span> <span word="if">if</span> <span word="they">they</span> <span word="have">have</span> <span word="no">no</span> <span word="member">member</span> <span word="in">in</span> <span word="common">common</span>， <span word="that">that</span> <span word="is">is</span> <span word="they">they</span> <span word="have">have</span> <span word="an">an</span> <span word="empty">empty</span> <span word="intersection">intersection</span>.</p><p> <span word="Union">Union</span> <span word="of">of</span> <span word="Sets">Sets</span></p><p> <span word="Union">Union</span> <span word="of">of</span> <span word="two">two</span> <span word="sets">sets</span> <span word="is">is</span> <span word="another">another</span> <span word="set">set</span> <span word="with">with</span> <span word="all">all</span> <span word="the">the</span> <span word="members">members</span> <span word="from">from</span> <span word="both">both</span> <span word="sets">sets</span>.</p><p> </p>
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