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<td > 本节主要介绍集合间的运算并由此定义集合代数。</td>
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<div align="center" >本节重点：</div>
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<div align="left" >集合运算、集合代数</div>
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<div align="center" >本节难点：</div>
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<div align="left" >集合的对成差</div>
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