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by Nonamenonamevi4

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  <title>Верхний и нижний индекс</title>
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  Характеристическое  уравнения поверхности второй степени
  <p>&lambda;<sup>3</sup>I<sub>l</sub>&lambda;<sup>2</sup> + I<sub>2</sub>&lambda; - I<sub>3</sub> = 0</p>
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