1. Докажите, что значение выражения [tex] \frac{2}{5 + \sqrt{7} } + \frac{2}{5 - \sqrt{7}

1. Докажите, что значение выражения [tex] \frac{2}{5 + \sqrt{7} } + \frac{2}{5 - \sqrt{7} }[/tex] есть число рациональное.

2. Докажите, что значение выражения [tex] \frac{3}{2+ 3\sqrt{3} } + \frac{3}{2-3 \sqrt{3} } [/tex] есть число рациональное.
- Предмет:
  Алгебра
- Автор:
  corychan
- 5 лет назад

Ответы 1

Опечатка в написании, 2-ку пропустили. А так, в целом я понял. Есть один вопрос, куда корень у 7-ки делся? Или его не надо писать. ( 25-7 ). Еще раз спасибо.
- Автор:
  natashapotter
- 5 лет назад
- 0
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