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    <title>数学强基 - Tag - Alexの小站</title>
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      <title>a^3 &#43; b^3 &#43; c^3 - 3abcの因式分解</title>
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      <description>详细推导 a^3 + b^3 + c^3 - 3abc = (a + b + c)(a² + b² + c² - ab - bc - ca) 的因式分解及应用</description>
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